Can You Pass This Aircraft Electrical System Test?

1. A cross wind causes a falling bomb to

Hit the target

Fall short of the target

Fall left or right of the target

Overshoot the target

When a bomb is dropped in a crosswind, the wind affects its trajectory and causes it to deviate from its intended path. The force of the wind pushes the bomb sideways, leading to it falling to the left or right of the target. This deviation occurs because the wind exerts a lateral force on the bomb, altering its course and preventing it from hitting the target directly.

Explanation

When a bomb is dropped in a crosswind, the wind affects its trajectory and causes it to deviate from its intended path. The force of the wind pushes the bomb sideways, leading to it falling to the left or right of the target. This deviation occurs because the wind exerts a lateral force on the bomb, altering its course and preventing it from hitting the target directly.

2. The effect of wind on an aircraft is

Unimportant

Negligible

Significant

Slight

The correct answer is "significant" because wind has a noticeable impact on the performance and handling of an aircraft. Wind can affect the aircraft's speed, direction, and stability, making it crucial for pilots to account for wind conditions during takeoff, landing, and flight. Wind can also cause turbulence, which can be uncomfortable for passengers and potentially hazardous if severe. Therefore, understanding and accounting for the effect of wind is essential for safe and efficient aircraft operations.

Explanation

The correct answer is "significant" because wind has a noticeable impact on the performance and handling of an aircraft. Wind can affect the aircraft's speed, direction, and stability, making it crucial for pilots to account for wind conditions during takeoff, landing, and flight. Wind can also cause turbulence, which can be uncomfortable for passengers and potentially hazardous if severe. Therefore, understanding and accounting for the effect of wind is essential for safe and efficient aircraft operations.

3. During the air align mode of the INU, how should the aircraft be flown?

With a slow descent at a constant velocity

Straight and level, and at a constant velocity

As normal; no special considerations are necessary

With a slow ascent at a constant velocity

During the air align mode of the INU, the aircraft should be flown straight and level, and at a constant velocity. This is because the air align mode is used to align the Inertial Navigation Unit (INU) with the actual flight path of the aircraft. Flying straight and level ensures that the INU is aligned with the true horizontal reference, while maintaining a constant velocity helps in accurately calibrating the INU's sensors. By flying in this manner, the INU can accurately determine the aircraft's position and attitude, providing reliable navigation information.

Explanation

During the air align mode of the INU, the aircraft should be flown straight and level, and at a constant velocity. This is because the air align mode is used to align the Inertial Navigation Unit (INU) with the actual flight path of the aircraft. Flying straight and level ensures that the INU is aligned with the true horizontal reference, while maintaining a constant velocity helps in accurately calibrating the INU's sensors. By flying in this manner, the INU can accurately determine the aircraft's position and attitude, providing reliable navigation information.

4. North on a compass rose is

90 degrees

270 degrees

180 degrees

0 degrees

North on a compass rose is represented by 0 degrees. In a compass, the needle points towards the Earth's magnetic north pole, which is considered as the reference point for determining directions. The needle aligns itself with the Earth's magnetic field, and when it points towards the magnetic north pole, it indicates north. Therefore, 0 degrees represents north on a compass rose.

Explanation

North on a compass rose is represented by 0 degrees. In a compass, the needle points towards the Earth's magnetic north pole, which is considered as the reference point for determining directions. The needle aligns itself with the Earth's magnetic field, and when it points towards the magnetic north pole, it indicates north. Therefore, 0 degrees represents north on a compass rose.

5. If the airspeed of the aircraft is too fast, a falling bomb

Hits the target

Overshoots the target

Falls to the side of the target

Falls short of the target

If the airspeed of the aircraft is too fast, a falling bomb will overshoot the target. This is because the momentum of the bomb, combined with the high speed of the aircraft, will cause it to continue moving forward even after it is released. As a result, the bomb will travel past the intended target before eventually falling to the ground.

Explanation

If the airspeed of the aircraft is too fast, a falling bomb will overshoot the target. This is because the momentum of the bomb, combined with the high speed of the aircraft, will cause it to continue moving forward even after it is released. As a result, the bomb will travel past the intended target before eventually falling to the ground.

6. Air resistance causing a falling bomb to

Fall unpredictably

Lag

Lead

Fall rapid

Air resistance can cause a falling bomb to lag behind its expected trajectory. When a bomb is dropped from a height, air resistance acts against its motion, slowing it down. This lag can cause the bomb to fall behind its predicted path, making its descent unpredictable. The force of air resistance depends on factors like the shape and size of the bomb, as well as the density of the air. Therefore, the bomb may experience a delay in its fall due to the opposing force of air resistance.

Explanation

Air resistance can cause a falling bomb to lag behind its expected trajectory. When a bomb is dropped from a height, air resistance acts against its motion, slowing it down. This lag can cause the bomb to fall behind its predicted path, making its descent unpredictable. The force of air resistance depends on factors like the shape and size of the bomb, as well as the density of the air. Therefore, the bomb may experience a delay in its fall due to the opposing force of air resistance.

7. A head wind causes a falling bomb to

Fall short of the target

Fall left or right of the target

Hit the target

Overshoot the target

A headwind creates resistance against the forward motion of the falling bomb. This resistance reduces the bomb's speed and distance traveled, causing it to fall short of the target.

Explanation

A headwind creates resistance against the forward motion of the falling bomb. This resistance reduces the bomb's speed and distance traveled, causing it to fall short of the target.

8. Which component in a pulse-modulation radar set provides the voltages that operate the other radar components?

Transmitter

Power supply

Indicator

Antenna

The power supply in a pulse-modulation radar set provides the voltages that operate the other radar components. It is responsible for supplying the necessary electrical power to the transmitter, indicator, and antenna, allowing them to function properly. Without the power supply, the other components would not receive the required voltages to operate effectively, resulting in a non-functional radar system.

Explanation

The power supply in a pulse-modulation radar set provides the voltages that operate the other radar components. It is responsible for supplying the necessary electrical power to the transmitter, indicator, and antenna, allowing them to function properly. Without the power supply, the other components would not receive the required voltages to operate effectively, resulting in a non-functional radar system.

9. In a frequency-shift radar system, what is the relationship between a transmitter/receiver and an aircraft when the received frequency is lower than the transmitted frequency?

They are a constant distance away from each other

The aircraft is flying away from the transmitter/receiver

The aircraft is not reflecting any of the radar pulses

The aircraft is flying towards the transmitter/receiver

When the received frequency is lower than the transmitted frequency in a frequency-shift radar system, it indicates that the aircraft is moving away from the transmitter/receiver. This is because the frequency shift occurs due to the Doppler effect, which is caused by the relative motion between the radar system and the aircraft. As the aircraft moves away, the received frequency appears lower due to the increase in the wavelength of the radar signal. Therefore, the correct answer is that the aircraft is flying away from the transmitter/receiver.

Explanation

When the received frequency is lower than the transmitted frequency in a frequency-shift radar system, it indicates that the aircraft is moving away from the transmitter/receiver. This is because the frequency shift occurs due to the Doppler effect, which is caused by the relative motion between the radar system and the aircraft. As the aircraft moves away, the received frequency appears lower due to the increase in the wavelength of the radar signal. Therefore, the correct answer is that the aircraft is flying away from the transmitter/receiver.

10. HAVE QUICK radios resist jamming by

Encryption

Phase shifting

Retransmission

Frequency-hopping

Frequency-hopping is a technique used by HAVE QUICK radios to resist jamming. This involves rapidly changing the frequency of the radio signal in a predetermined pattern. By constantly hopping between frequencies, it becomes difficult for an adversary to jam or intercept the signal effectively. This technique adds a layer of security and ensures reliable communication even in the presence of interference or jamming attempts.

Explanation

Frequency-hopping is a technique used by HAVE QUICK radios to resist jamming. This involves rapidly changing the frequency of the radio signal in a predetermined pattern. By constantly hopping between frequencies, it becomes difficult for an adversary to jam or intercept the signal effectively. This technique adds a layer of security and ensures reliable communication even in the presence of interference or jamming attempts.

11. What is used to correct true heading and allow the aircraft to make good the desired true course?

Drift correction

Ground speed correction

Airspeed correction

Wind disbursement

Drift correction is used to correct the true heading of an aircraft and allow it to make good the desired true course. When an aircraft is affected by wind drift, it can deviate from its intended course. Drift correction involves adjusting the aircraft's heading to compensate for the effect of wind, ensuring that it stays on track and maintains the desired true course. By making these corrections, the aircraft can navigate accurately and reach its destination as planned.

Explanation

Drift correction is used to correct the true heading of an aircraft and allow it to make good the desired true course. When an aircraft is affected by wind drift, it can deviate from its intended course. Drift correction involves adjusting the aircraft's heading to compensate for the effect of wind, ensuring that it stays on track and maintains the desired true course. By making these corrections, the aircraft can navigate accurately and reach its destination as planned.

12. What LRU consists of a gyro-stabilized platform, platform electronics, navigation computer, input/output functions, and power supply?

General navigation avionics control unit

Inertial navigation unit

Terrain-following avionics control unit

Doppler velocity sensor

The correct answer is the Inertial navigation unit. An inertial navigation unit is a system that uses gyroscopes and accelerometers to measure changes in velocity and orientation. It consists of a gyro-stabilized platform, platform electronics, navigation computer, input/output functions, and power supply. This unit is commonly used in aircraft and other vehicles for navigation purposes, as it can provide accurate position and velocity information even without external references.

Explanation

The correct answer is the Inertial navigation unit. An inertial navigation unit is a system that uses gyroscopes and accelerometers to measure changes in velocity and orientation. It consists of a gyro-stabilized platform, platform electronics, navigation computer, input/output functions, and power supply. This unit is commonly used in aircraft and other vehicles for navigation purposes, as it can provide accurate position and velocity information even without external references.

13. The polar axis is the

Circle equal distance from the poles

Axis about which the earth rotates

Circle formed by any plane that passes through the center of the earth

Axis about which the moon rotates

The polar axis refers to the axis about which the earth rotates. This axis passes through the North and South poles of the earth and is responsible for the rotation of the planet. It is an imaginary line that connects the two poles and determines the earth's rotational axis. The rotation of the earth around this axis causes the cycle of day and night as well as the movement of celestial objects across the sky.

Explanation

The polar axis refers to the axis about which the earth rotates. This axis passes through the North and South poles of the earth and is responsible for the rotation of the planet. It is an imaginary line that connects the two poles and determines the earth's rotational axis. The rotation of the earth around this axis causes the cycle of day and night as well as the movement of celestial objects across the sky.

14. The sideward displacement of an aircraft by the wind is called

Deviation

Yaw

Groundspeed

Drift

The sideward displacement of an aircraft by the wind is referred to as "drift." When an aircraft is flying in windy conditions, the wind can push it off its intended course, causing it to drift sideways. This can be a challenge for pilots, as they need to constantly adjust their heading to compensate for the drift and maintain their desired track. Understanding and managing drift is crucial for safe and accurate navigation during flight.

Explanation

The sideward displacement of an aircraft by the wind is referred to as "drift." When an aircraft is flying in windy conditions, the wind can push it off its intended course, causing it to drift sideways. This can be a challenge for pilots, as they need to constantly adjust their heading to compensate for the drift and maintain their desired track. Understanding and managing drift is crucial for safe and accurate navigation during flight.

15. The rate of movement of an aircraft relative to the Earth's surface is called

Airspeed

Velocity

Groundspeed

Drift

Groundspeed refers to the rate at which an aircraft is moving relative to the Earth's surface. It represents the actual speed of the aircraft with respect to the ground, taking into account the effects of wind and other factors. Airspeed, on the other hand, refers to the rate of movement of an aircraft relative to the air mass in which it is flying. Velocity is a more general term that can refer to both groundspeed and airspeed, depending on the context. Drift is not the correct answer as it does not specifically refer to the rate of movement of an aircraft relative to the Earth's surface.

Explanation

Groundspeed refers to the rate at which an aircraft is moving relative to the Earth's surface. It represents the actual speed of the aircraft with respect to the ground, taking into account the effects of wind and other factors. Airspeed, on the other hand, refers to the rate of movement of an aircraft relative to the air mass in which it is flying. Velocity is a more general term that can refer to both groundspeed and airspeed, depending on the context. Drift is not the correct answer as it does not specifically refer to the rate of movement of an aircraft relative to the Earth's surface.

16. The prime meridian is the

Circle equal distance between the north and south poles

Meridian passing through Greenwich, England

Meridian designated the 180 degree meridian

Circle designated 0 degree latitude

The prime meridian is the meridian passing through Greenwich, England. This is the correct answer because the prime meridian is an imaginary line that represents 0 degrees longitude. It is used as a reference point for measuring longitude and dividing the Earth into the Eastern and Western Hemispheres. The choice "circle equal distance between the north and south poles" is incorrect because the prime meridian is a line, not a circle. The choices "meridian designated the 180 degree meridian" and "circle designated 0 degree latitude" are also incorrect because they do not accurately describe the prime meridian.

Explanation

The prime meridian is the meridian passing through Greenwich, England. This is the correct answer because the prime meridian is an imaginary line that represents 0 degrees longitude. It is used as a reference point for measuring longitude and dividing the Earth into the Eastern and Western Hemispheres. The choice "circle equal distance between the north and south poles" is incorrect because the prime meridian is a line, not a circle. The choices "meridian designated the 180 degree meridian" and "circle designated 0 degree latitude" are also incorrect because they do not accurately describe the prime meridian.

17. From the prime meridian west to the international dateline, meridians are assigned values of

0 to 90 degrees east

0 to 90 degrees west

0 to 180 degrees west

0 to 180 degrees east

Meridians are imaginary lines that run from the North Pole to the South Pole, dividing the Earth into longitudes. The prime meridian is the starting point for measuring longitudes and is assigned a value of 0 degrees. Moving west from the prime meridian, the values of meridians increase until reaching the international dateline, where they are assigned a value of 180 degrees west. Therefore, the correct answer is 0 to 180 degrees west, as it represents the range of values for meridians from the prime meridian to the international dateline.

Explanation

Meridians are imaginary lines that run from the North Pole to the South Pole, dividing the Earth into longitudes. The prime meridian is the starting point for measuring longitudes and is assigned a value of 0 degrees. Moving west from the prime meridian, the values of meridians increase until reaching the international dateline, where they are assigned a value of 180 degrees west. Therefore, the correct answer is 0 to 180 degrees west, as it represents the range of values for meridians from the prime meridian to the international dateline.

18. A vector diagram that shows the effect of the wind on the flight of an aircraft is called the

Wind triangle

Navigation chart

Destination chart

Flight path

A vector diagram that shows the effect of the wind on the flight of an aircraft is called the wind triangle. This diagram is used in navigation to calculate the aircraft's ground speed, true heading, and drift angle caused by the wind. By using the wind triangle, pilots can make adjustments to their flight path and maintain accurate navigation. It is an essential tool for flight planning and ensuring safe and efficient travel.

Explanation

A vector diagram that shows the effect of the wind on the flight of an aircraft is called the wind triangle. This diagram is used in navigation to calculate the aircraft's ground speed, true heading, and drift angle caused by the wind. By using the wind triangle, pilots can make adjustments to their flight path and maintain accurate navigation. It is an essential tool for flight planning and ensuring safe and efficient travel.

19. What avionics multiplexing data bus provides the path for the inertial navigation unit to communicate with the avionics control unit complex and, eventually, all other aircraft systems?

AMUX

CMUX

DMUX

BMUX

AMUX stands for Avionics Multiplexing data bus. It provides the path for the inertial navigation unit to communicate with the avionics control unit complex and eventually with all other aircraft systems.

Explanation

AMUX stands for Avionics Multiplexing data bus. It provides the path for the inertial navigation unit to communicate with the avionics control unit complex and eventually with all other aircraft systems.

20. Which GPS component is passive, meaning it does not require power, adjustments, or controls to function?

Antenna amplifier

Antenna controller

Receiver

Antenna

The antenna is the GPS component that is passive, meaning it does not require power, adjustments, or controls to function. The antenna is responsible for receiving the GPS signals from the satellites and does not require any additional components or power to perform its function. It simply captures the signals and sends them to the receiver for further processing.

Explanation

The antenna is the GPS component that is passive, meaning it does not require power, adjustments, or controls to function. The antenna is responsible for receiving the GPS signals from the satellites and does not require any additional components or power to perform its function. It simply captures the signals and sends them to the receiver for further processing.

21. In a frequency-shift radar system, what is the relationship between a transmitter/receiver and an aircraft when no frequency shift between them can be measured?

They are a constant distance away from each other

The aircraft is flying away from the transmitter/receiver

The aircraft is not reflecting any of the radar pulses

The aircraft is flying towards the transmitter/receiver

When no frequency shift can be measured between the transmitter/receiver and the aircraft in a frequency-shift radar system, it indicates that they are a constant distance away from each other. This means that the aircraft is neither moving towards nor away from the transmitter/receiver. The absence of frequency shift suggests that the radar pulses are not being reflected by the aircraft, which implies that the aircraft is not in motion relative to the radar system. Therefore, the constant distance between them remains unchanged.

Explanation

When no frequency shift can be measured between the transmitter/receiver and the aircraft in a frequency-shift radar system, it indicates that they are a constant distance away from each other. This means that the aircraft is neither moving towards nor away from the transmitter/receiver. The absence of frequency shift suggests that the radar pulses are not being reflected by the aircraft, which implies that the aircraft is not in motion relative to the radar system. Therefore, the constant distance between them remains unchanged.

22. Which radar application is used to produce a pictorial map of the terrain?

Terrain avoidance

Ground mapping

Synthetic aperture radar

Terrain-following

Ground mapping is the radar application used to produce a pictorial map of the terrain. This technique involves using radar signals to create a detailed image of the ground below, allowing for accurate mapping and identification of terrain features such as mountains, valleys, and bodies of water. Ground mapping is commonly used in various applications such as military operations, surveying, and navigation. It provides valuable information for terrain analysis, route planning, and target identification.

Explanation

Ground mapping is the radar application used to produce a pictorial map of the terrain. This technique involves using radar signals to create a detailed image of the ground below, allowing for accurate mapping and identification of terrain features such as mountains, valleys, and bodies of water. Ground mapping is commonly used in various applications such as military operations, surveying, and navigation. It provides valuable information for terrain analysis, route planning, and target identification.

23. In navigation, the primary reference is

90 degrees

North

The equator

0 degrees

The primary reference in navigation is north because it is used as a point of reference for determining direction. North is a fixed point on the Earth's surface, and navigators use it as a guide to establish their position and plot their course. By referencing north, navigators can determine their heading and make accurate calculations for navigation purposes.

Explanation

The primary reference in navigation is north because it is used as a point of reference for determining direction. North is a fixed point on the Earth's surface, and navigators use it as a guide to establish their position and plot their course. By referencing north, navigators can determine their heading and make accurate calculations for navigation purposes.

24. Which is used to maintain accelerometer orientation in the inertial navigation system?

Platform

Summing unit

Integrator

Computer

The platform is used to maintain accelerometer orientation in the inertial navigation system. The platform is a stable and rigid structure that houses the accelerometers and other sensors. It is designed to isolate the accelerometers from external motion and provide a stable reference frame for measuring acceleration. By keeping the accelerometers fixed relative to the platform, any motion experienced by the platform can be accurately measured and used to determine the orientation and position of the system.

Explanation

The platform is used to maintain accelerometer orientation in the inertial navigation system. The platform is a stable and rigid structure that houses the accelerometers and other sensors. It is designed to isolate the accelerometers from external motion and provide a stable reference frame for measuring acceleration. By keeping the accelerometers fixed relative to the platform, any motion experienced by the platform can be accurately measured and used to determine the orientation and position of the system.

25. In a pulse-modulation radar system, the transmitter does not interfere with the receiver because the transmitter

Uses a different antenna than the receiver

Transmits on a different frequency

Shifts the frequency of the pulse

Is turned off after each pulse

In a pulse-modulation radar system, the transmitter is turned off after each pulse. This ensures that the transmitter does not interfere with the receiver during the receiving phase. By turning off the transmitter, it allows the receiver to accurately detect and process the returning echoes without any interference from the transmitter's own signals. This helps in improving the accuracy and reliability of the radar system.

Explanation

In a pulse-modulation radar system, the transmitter is turned off after each pulse. This ensures that the transmitter does not interfere with the receiver during the receiving phase. By turning off the transmitter, it allows the receiver to accurately detect and process the returning echoes without any interference from the transmitter's own signals. This helps in improving the accuracy and reliability of the radar system.

26. In a frequency-shift radar system, what is the relationship between a transmitter/receiver and an aircraft when the received frequency is higher than the transmitted frequency?

They are a constant distance away from each other

The aircraft is flying away from the transmitter/receiver

The aircraft is flying towards the transmitter/receiver

The aircraft is not reflecting any of the radar pulses

When the received frequency is higher than the transmitted frequency in a frequency-shift radar system, it indicates that the aircraft is flying towards the transmitter/receiver. This is because the Doppler effect causes the frequency of the radar waves reflected off the moving aircraft to increase. This increase in frequency suggests that the aircraft is approaching the radar system, resulting in a higher received frequency.

Explanation

When the received frequency is higher than the transmitted frequency in a frequency-shift radar system, it indicates that the aircraft is flying towards the transmitter/receiver. This is because the Doppler effect causes the frequency of the radar waves reflected off the moving aircraft to increase. This increase in frequency suggests that the aircraft is approaching the radar system, resulting in a higher received frequency.

27. What is formed on the surface of the Earth by any plane that passes through the center of the Earth and divides it into two equal parts?

Parallel of latitude

Great circle

Meridian of longitude

Equator

A great circle is formed on the surface of the Earth by any plane that passes through the center of the Earth and divides it into two equal parts. This means that a great circle is a circle that has the same diameter as the Earth and divides it into two hemispheres. The equator is a specific example of a great circle, as it is formed by a plane that passes through the center of the Earth and divides it into the northern and southern hemispheres. Therefore, the correct answer is great circle.

Explanation

A great circle is formed on the surface of the Earth by any plane that passes through the center of the Earth and divides it into two equal parts. This means that a great circle is a circle that has the same diameter as the Earth and divides it into two hemispheres. The equator is a specific example of a great circle, as it is formed by a plane that passes through the center of the Earth and divides it into the northern and southern hemispheres. Therefore, the correct answer is great circle.

28. The preplanned flight route can be described in the

Stores table

Gravity table

Release table

Action point table

The preplanned flight route can be described in the action point table. This table would contain information about the specific points or locations where certain actions or maneuvers need to be performed during the flight. It would outline the sequence of actions and the corresponding points on the route where they should be executed. This table helps ensure that the flight follows the planned route accurately and that all necessary actions are carried out at the appropriate locations.

Explanation

The preplanned flight route can be described in the action point table. This table would contain information about the specific points or locations where certain actions or maneuvers need to be performed during the flight. It would outline the sequence of actions and the corresponding points on the route where they should be executed. This table helps ensure that the flight follows the planned route accurately and that all necessary actions are carried out at the appropriate locations.

29. The indicators on the front of the inertial navigation unit are used to

Allow adjustments to the inertial navigation unit

Identify malfunctions within the inertial navigation unit

Indicate the normal operation of the inertial navigation unit

Provide inputs during checkout

The indicators on the front of the inertial navigation unit are used to identify malfunctions within the unit. These indicators are designed to provide visual cues or signals that alert the user to any potential issues or faults with the navigation unit. By monitoring these indicators, the user can quickly identify and address any malfunctions, ensuring the proper functioning of the inertial navigation unit and maintaining accurate navigation capabilities.

Explanation

The indicators on the front of the inertial navigation unit are used to identify malfunctions within the unit. These indicators are designed to provide visual cues or signals that alert the user to any potential issues or faults with the navigation unit. By monitoring these indicators, the user can quickly identify and address any malfunctions, ensuring the proper functioning of the inertial navigation unit and maintaining accurate navigation capabilities.

30. What INU mode is about 45 minutes in duration?

Stored heading align

Precision align

Air align

Navigate

Precision align is a mode that takes about 45 minutes to complete. During this mode, the system aligns the heading of the INU (Inertial Navigation Unit) to a high level of accuracy. This process involves using various sensors and algorithms to determine the precise orientation of the INU relative to the Earth's reference frame. Once the precision alignment is complete, the INU is ready to provide accurate navigation information for the duration of the mission or operation.

Explanation

Precision align is a mode that takes about 45 minutes to complete. During this mode, the system aligns the heading of the INU (Inertial Navigation Unit) to a high level of accuracy. This process involves using various sensors and algorithms to determine the precise orientation of the INU relative to the Earth's reference frame. Once the precision alignment is complete, the INU is ready to provide accurate navigation information for the duration of the mission or operation.

31. In GPS, almanac data is transmitted to each satellite to each satellite to update the navigation data message once every

48 hours

24 hours

12 hours

6 hours

Almanac data is essential for GPS satellites to accurately determine their own position and transmit accurate navigation data to GPS receivers. This data includes information about the satellite's orbital parameters, clock corrections, and health status. To ensure that the navigation data is up to date, the almanac data is transmitted to each satellite once every 24 hours. This regular update helps maintain the accuracy and reliability of the GPS system for users worldwide.

Explanation

Almanac data is essential for GPS satellites to accurately determine their own position and transmit accurate navigation data to GPS receivers. This data includes information about the satellite's orbital parameters, clock corrections, and health status. To ensure that the navigation data is up to date, the almanac data is transmitted to each satellite once every 24 hours. This regular update helps maintain the accuracy and reliability of the GPS system for users worldwide.

32. Which component in a pulse-modulation radar system shapes the radio-frequency energy into a narrow beam?

Antenna

Transmitter

Synchronizer

Indicator

The antenna in a pulse-modulation radar system shapes the radio-frequency energy into a narrow beam. Antennas are designed to focus and direct the radio waves in a specific direction, allowing the radar system to accurately detect and track targets within that beam. By controlling the shape and direction of the beam, the antenna helps to optimize the radar system's performance and increase its range and accuracy.

Explanation

The antenna in a pulse-modulation radar system shapes the radio-frequency energy into a narrow beam. Antennas are designed to focus and direct the radio waves in a specific direction, allowing the radar system to accurately detect and track targets within that beam. By controlling the shape and direction of the beam, the antenna helps to optimize the radar system's performance and increase its range and accuracy.

33. What is produced in the pulse-modulation radar system by heterodyning?

Intermediate-frequency

Very-low frequency

High-frequency

Very-high frequency

In a pulse-modulation radar system, heterodyning is the process of combining two frequencies to produce a third frequency. This third frequency is known as the intermediate-frequency (IF). Heterodyning is used to convert the received radar signal to a lower frequency that is easier to process and analyze. The IF signal contains the information about the target's range and velocity, which is then used to generate a radar display. Therefore, the correct answer is intermediate-frequency.

Explanation

In a pulse-modulation radar system, heterodyning is the process of combining two frequencies to produce a third frequency. This third frequency is known as the intermediate-frequency (IF). Heterodyning is used to convert the received radar signal to a lower frequency that is easier to process and analyze. The IF signal contains the information about the target's range and velocity, which is then used to generate a radar display. Therefore, the correct answer is intermediate-frequency.

34. The ability of a radio receiver to reproduce weak signals is called

Reception

Sensitivity

Detection

Reproduction

The correct answer is sensitivity. Sensitivity refers to the ability of a radio receiver to accurately reproduce weak signals. A receiver with high sensitivity can pick up and amplify faint signals, allowing for better reception and detection of weak radio waves. This is an important characteristic for radio receivers, as it determines their effectiveness in capturing and reproducing weak signals.

Explanation

The correct answer is sensitivity. Sensitivity refers to the ability of a radio receiver to accurately reproduce weak signals. A receiver with high sensitivity can pick up and amplify faint signals, allowing for better reception and detection of weak radio waves. This is an important characteristic for radio receivers, as it determines their effectiveness in capturing and reproducing weak signals.

35. UHF radios are primarily used for

Line-of-sight communication

Communication with civilian air traffic controllers

Long range communications

Direction-finding operations

UHF radios are primarily used for line-of-sight communication because they operate on the ultra-high frequency range, which allows for shorter wavelengths and better signal propagation over shorter distances. Line-of-sight communication refers to the ability to transmit and receive signals directly between two points without any obstructions in the path. UHF radios are commonly used in scenarios where direct communication between individuals or within a limited range is required, such as in military operations, emergency services, and short-range communication between vehicles or handheld devices.

Explanation

UHF radios are primarily used for line-of-sight communication because they operate on the ultra-high frequency range, which allows for shorter wavelengths and better signal propagation over shorter distances. Line-of-sight communication refers to the ability to transmit and receive signals directly between two points without any obstructions in the path. UHF radios are commonly used in scenarios where direct communication between individuals or within a limited range is required, such as in military operations, emergency services, and short-range communication between vehicles or handheld devices.

36. When two signals are received simultaneously on the same operating net, the HAVE QUICK II radio automatically goes into conferencing by

Setting the receiver to narrowband reception

Injecting a beat frequency to make both signals unintelligible

Offsetting the second transmitter frequency by 25 KHz

Resetting the net number for communication

The correct answer is "offsetting the second transmitter frequency by 25 KHz". When two signals are received simultaneously on the same operating net, the HAVE QUICK II radio automatically offsets the frequency of the second transmitter by 25 KHz. This is done to avoid interference and ensure that both signals can be received and distinguished properly. By offsetting the frequency, the radio can separate the two signals and allow for clear and intelligible communication.

Explanation

The correct answer is "offsetting the second transmitter frequency by 25 KHz". When two signals are received simultaneously on the same operating net, the HAVE QUICK II radio automatically offsets the frequency of the second transmitter by 25 KHz. This is done to avoid interference and ensure that both signals can be received and distinguished properly. By offsetting the frequency, the radio can separate the two signals and allow for clear and intelligible communication.

37. Which system utilizes the equator as one fixed regerence point and the Greenwich meridian as the other fixed reference point?

Instrument landing

Aircraft landing

Geographic coordinate

Inertial navigation

The geographic coordinate system utilizes the equator as one fixed reference point and the Greenwich meridian as the other fixed reference point. This system is commonly used to determine the precise location of a point on the Earth's surface using latitude and longitude coordinates. It provides a standardized way to express locations and is widely used in navigation, mapping, and surveying.

Explanation

The geographic coordinate system utilizes the equator as one fixed reference point and the Greenwich meridian as the other fixed reference point. This system is commonly used to determine the precise location of a point on the Earth's surface using latitude and longitude coordinates. It provides a standardized way to express locations and is widely used in navigation, mapping, and surveying.

38. On navigation charts, the lines that connect points of equal magnetic variation are called

Deviation lines

Agonic

Variation lines

Isogonic

Isogonic lines on navigation charts connect points of equal magnetic variation. These lines help sailors and pilots to determine the angle between true north and magnetic north at a given location. By following isogonic lines, navigators can adjust their compass readings to account for the magnetic variation and accurately navigate their course.

Explanation

Isogonic lines on navigation charts connect points of equal magnetic variation. These lines help sailors and pilots to determine the angle between true north and magnetic north at a given location. By following isogonic lines, navigators can adjust their compass readings to account for the magnetic variation and accurately navigate their course.

39. Below what temperature does the modulator valve close to prevent over-cooling of the INU?

80 F

170 F

120 F

90 F

The modulator valve closes below 80°F to prevent over-cooling of the INU.

Explanation

The modulator valve closes below 80°F to prevent over-cooling of the INU.

40. In which radar system is the transmitter turned on for short periods of time and off for long periods of time?

Beacon

Frequency-shift

Frequency-modulation

Pulse-modulation

Pulse-modulation is the correct answer because in this radar system, the transmitter is turned on for short periods of time and then turned off for long periods of time. This allows the radar to transmit pulses of energy and then listen for the echoes that bounce back from targets. By using this on-off pattern, the radar can conserve power and reduce the chances of interference from other radar systems.

Explanation

Pulse-modulation is the correct answer because in this radar system, the transmitter is turned on for short periods of time and then turned off for long periods of time. This allows the radar to transmit pulses of energy and then listen for the echoes that bounce back from targets. By using this on-off pattern, the radar can conserve power and reduce the chances of interference from other radar systems.

41. In a pulse-modulation radar system, the pulse repetition frequency is the number of pulses

That are transmitted within 1 second

That strike the target within 1 second

Transmitted during the listening time

That are received within 1 second

The pulse repetition frequency in a pulse-modulation radar system refers to the number of pulses that are transmitted within 1 second. This means that it measures the rate at which the radar system sends out pulses of electromagnetic energy. By knowing the pulse repetition frequency, the radar system can determine the distance to a target based on the time it takes for the pulse to travel to the target and back.

Explanation

The pulse repetition frequency in a pulse-modulation radar system refers to the number of pulses that are transmitted within 1 second. This means that it measures the rate at which the radar system sends out pulses of electromagnetic energy. By knowing the pulse repetition frequency, the radar system can determine the distance to a target based on the time it takes for the pulse to travel to the target and back.

42. Which radar altimeter mode is initiated when an insufficient amount of return video is present during the keyed automatic gain control gate?

Search/loss of track

Track

Ground map

Standby

When an insufficient amount of return video is present during the keyed automatic gain control gate, it indicates that the radar is unable to track or maintain contact with the target. This could be due to various reasons such as the target being out of range or obscured. In such cases, the radar altimeter mode that is initiated is the "Search/loss of track" mode, which is used to search for and reacquire the target or track it again.

Explanation

When an insufficient amount of return video is present during the keyed automatic gain control gate, it indicates that the radar is unable to track or maintain contact with the target. This could be due to various reasons such as the target being out of range or obscured. In such cases, the radar altimeter mode that is initiated is the "Search/loss of track" mode, which is used to search for and reacquire the target or track it again.

43. The changing of position with respect to some other body is called

Speed

Reference

Motion

Velocity

Motion refers to the changing of position with respect to some other body. It is the movement or displacement of an object in relation to its surroundings. Speed refers to the rate at which an object covers distance, while velocity refers to the rate at which an object changes its position in a particular direction. Reference is a point or object used for comparison to determine motion or position. Therefore, the correct answer is motion as it specifically refers to the changing of position.

Explanation

Motion refers to the changing of position with respect to some other body. It is the movement or displacement of an object in relation to its surroundings. Speed refers to the rate at which an object covers distance, while velocity refers to the rate at which an object changes its position in a particular direction. Reference is a point or object used for comparison to determine motion or position. Therefore, the correct answer is motion as it specifically refers to the changing of position.

44. A VHF frequency-modulated radio is mainly used on aircraft that

Contact Army ground troops

Are under the control of civilian air traffic controllers

Use Air Force-controlled airfields

Contact airborne tankers for refueling

A VHF frequency-modulated radio is mainly used on aircraft that contact Army ground troops. This type of radio is commonly used for communication between aircraft and ground troops during military operations. It allows for effective and efficient communication, ensuring coordination and cooperation between the aircraft and the Army ground troops.

Explanation

A VHF frequency-modulated radio is mainly used on aircraft that contact Army ground troops. This type of radio is commonly used for communication between aircraft and ground troops during military operations. It allows for effective and efficient communication, ensuring coordination and cooperation between the aircraft and the Army ground troops.

45. Errors in the orbit and clock data of the GPS satellites are detected in the

Global positioning system

Satellites

Monitor stations

Master control station

The monitor stations in the global positioning system are responsible for detecting errors in the orbit and clock data of the GPS satellites. These stations constantly monitor the signals and data transmitted by the satellites and compare them with the expected values. Any discrepancies or inconsistencies are flagged as errors, which can then be corrected or adjusted by the master control station. The monitor stations play a crucial role in ensuring the accuracy and reliability of the GPS system by identifying and rectifying any issues with the satellite data.

Explanation

The monitor stations in the global positioning system are responsible for detecting errors in the orbit and clock data of the GPS satellites. These stations constantly monitor the signals and data transmitted by the satellites and compare them with the expected values. Any discrepancies or inconsistencies are flagged as errors, which can then be corrected or adjusted by the master control station. The monitor stations play a crucial role in ensuring the accuracy and reliability of the GPS system by identifying and rectifying any issues with the satellite data.

46. Which GPS unit provides a display for the ARN-151?

Indicator control

Receiver

Antenna controller

Mount

The correct answer is Indicator control. The question is asking which GPS unit provides a display for the ARN-151. The Indicator control is the unit that typically includes a display for showing GPS information. The receiver is responsible for receiving GPS signals, the antenna controller manages the antenna, and the mount is used to physically secure the GPS unit. Therefore, the Indicator control is the most likely unit to provide a display for the ARN-151.

Explanation

The correct answer is Indicator control. The question is asking which GPS unit provides a display for the ARN-151. The Indicator control is the unit that typically includes a display for showing GPS information. The receiver is responsible for receiving GPS signals, the antenna controller manages the antenna, and the mount is used to physically secure the GPS unit. Therefore, the Indicator control is the most likely unit to provide a display for the ARN-151.

47. Relative bearing of an aircraft is the direction measured clockwise from

The aircraft heading to the object

True north to the object

0 degrees to the object

The object to true north

The relative bearing of an aircraft is the direction measured clockwise from the aircraft heading to the object. This means that it indicates the angle between the aircraft's heading and the direction of the object. It helps the pilot understand the position of the object in relation to their aircraft and aids in navigation and situational awareness.

Explanation

The relative bearing of an aircraft is the direction measured clockwise from the aircraft heading to the object. This means that it indicates the angle between the aircraft's heading and the direction of the object. It helps the pilot understand the position of the object in relation to their aircraft and aids in navigation and situational awareness.

48. What LRU is the prime sensor for measuring motion and velocity, and establishes and maintains a measurable frame of reference on the B-1B?

General navigation avionics control unit

Inertial navigation unit

Terrain-following avionics control unit

Doppler velocity sensor

The correct answer is the inertial navigation unit. The inertial navigation unit is the prime sensor for measuring motion and velocity on the B-1B. It establishes and maintains a measurable frame of reference by using accelerometers and gyroscopes to track changes in velocity and direction. This information is crucial for accurate navigation and guidance of the aircraft. The other options, such as the general navigation avionics control unit and terrain-following avionics control unit, may play a role in navigation but are not specifically designed for measuring motion and velocity. The Doppler velocity sensor is also used for measuring velocity but is not the primary sensor on the B-1B.

Explanation

The correct answer is the inertial navigation unit. The inertial navigation unit is the prime sensor for measuring motion and velocity on the B-1B. It establishes and maintains a measurable frame of reference by using accelerometers and gyroscopes to track changes in velocity and direction. This information is crucial for accurate navigation and guidance of the aircraft. The other options, such as the general navigation avionics control unit and terrain-following avionics control unit, may play a role in navigation but are not specifically designed for measuring motion and velocity. The Doppler velocity sensor is also used for measuring velocity but is not the primary sensor on the B-1B.

49. Which component is the central controller for the INU?

Stabilized platform

Platform electronics

Power supply

Navigation computer

The navigation computer is the central controller for the Inertial Navigation Unit (INU). It is responsible for processing and integrating data from various sensors to determine the position, velocity, and attitude of the platform. The navigation computer plays a crucial role in providing accurate navigation and guidance information to the system.

Explanation

The navigation computer is the central controller for the Inertial Navigation Unit (INU). It is responsible for processing and integrating data from various sensors to determine the position, velocity, and attitude of the platform. The navigation computer plays a crucial role in providing accurate navigation and guidance information to the system.

50. The GPS has a three-dimensional position navigation accuracy of

16 meters

0.16 meters

1.6 meters

160 meters

The GPS has a three-dimensional position navigation accuracy of 16 meters. This means that the GPS system is able to determine the user's position with an accuracy of 16 meters in all three dimensions (latitude, longitude, and altitude). This level of accuracy is considered to be quite good for most navigation purposes, as it allows for precise location tracking and navigation.

Explanation

The GPS has a three-dimensional position navigation accuracy of 16 meters. This means that the GPS system is able to determine the user's position with an accuracy of 16 meters in all three dimensions (latitude, longitude, and altitude). This level of accuracy is considered to be quite good for most navigation purposes, as it allows for precise location tracking and navigation.

51. When the operator initializes the GPS, what is provided to the GPS to begin satellite tracking?

Position, altitude, and speed

Position, time, and almanac information

Altitude, time, and speed

Altitude, time, and almanac information

When the operator initializes the GPS, they provide the GPS with position, time, and almanac information to begin satellite tracking. This information is crucial for the GPS to accurately calculate the user's position and track the satellites in the sky. The position helps the GPS receiver estimate the distance to the satellites, the time is used for precise timing, and the almanac information provides the orbital parameters of the satellites in the GPS constellation. With these inputs, the GPS can start tracking the satellites and provide accurate positioning information to the user.

Explanation

When the operator initializes the GPS, they provide the GPS with position, time, and almanac information to begin satellite tracking. This information is crucial for the GPS to accurately calculate the user's position and track the satellites in the sky. The position helps the GPS receiver estimate the distance to the satellites, the time is used for precise timing, and the almanac information provides the orbital parameters of the satellites in the GPS constellation. With these inputs, the GPS can start tracking the satellites and provide accurate positioning information to the user.

52. Which part of a radar set amplifies and converts a wave into a video signal?

Transmitter

Indicator

Receiver

Antenna

The receiver in a radar set is responsible for amplifying and converting the received wave into a video signal. It receives the reflected wave from the target through the antenna and processes it to extract information about the target's location, speed, and other characteristics. The receiver amplifies the weak signal to make it more easily detectable and converts it into a video signal that can be displayed on the indicator for the radar operator to analyze.

Explanation

The receiver in a radar set is responsible for amplifying and converting the received wave into a video signal. It receives the reflected wave from the target through the antenna and processes it to extract information about the target's location, speed, and other characteristics. The receiver amplifies the weak signal to make it more easily detectable and converts it into a video signal that can be displayed on the indicator for the radar operator to analyze.

53. Which radar set LRU performs highly accurate electronic beam steering?

Radar transmitter

Low observable antenna

Radar set control

Radar data terminal

The low observable antenna performs highly accurate electronic beam steering in a radar set. This means that it is able to precisely control the direction and focus of the radar beam, allowing for more accurate and efficient radar operations. The other options, such as the radar transmitter, radar set control, and radar data terminal, may play important roles in the overall functioning of the radar system, but they do not specifically perform the highly accurate electronic beam steering function.

Explanation

The low observable antenna performs highly accurate electronic beam steering in a radar set. This means that it is able to precisely control the direction and focus of the radar beam, allowing for more accurate and efficient radar operations. The other options, such as the radar transmitter, radar set control, and radar data terminal, may play important roles in the overall functioning of the radar system, but they do not specifically perform the highly accurate electronic beam steering function.

54. Ina typical amplitude-modulated superheterodyne receiver, the process used to tuned two or more circuits with a single control is called

Slug tuning

Ganged tuning

Staggered tuning

Parallel tuning

Ganged tuning is the process used in a typical amplitude-modulated superheterodyne receiver to tune two or more circuits with a single control. This means that when the control is adjusted, it simultaneously adjusts the tuning of multiple circuits in the receiver. This allows for easier and more efficient tuning of the receiver, as all the circuits can be tuned together with a single adjustment.

Explanation

Ganged tuning is the process used in a typical amplitude-modulated superheterodyne receiver to tune two or more circuits with a single control. This means that when the control is adjusted, it simultaneously adjusts the tuning of multiple circuits in the receiver. This allows for easier and more efficient tuning of the receiver, as all the circuits can be tuned together with a single adjustment.

55. In the ARC-190 HF radio system, the HF coupler matches the impedance of the antenna to the RT in order to

Give maximum power transfer

Increase receiver sensitivity

Increase transmitter selectivity

Increase the VSWR

The HF coupler in the ARC-190 HF radio system matches the impedance of the antenna to the RT (radio transmitter) in order to give maximum power transfer. By matching the impedance, the coupler ensures that the maximum amount of power from the transmitter is efficiently transferred to the antenna, resulting in effective communication. This allows for optimal signal strength and transmission quality.

Explanation

The HF coupler in the ARC-190 HF radio system matches the impedance of the antenna to the RT (radio transmitter) in order to give maximum power transfer. By matching the impedance, the coupler ensures that the maximum amount of power from the transmitter is efficiently transferred to the antenna, resulting in effective communication. This allows for optimal signal strength and transmission quality.

56. From the prime meridian east to the international dateline, meridians are assigned values of

0 to 90 degrees east

0 to 180 degrees west

0 to 90 degrees west

0 to 180 east

Meridians are imaginary lines that run from the North Pole to the South Pole and are used to measure longitude. The prime meridian is the starting point for measuring longitude and is assigned a value of 0 degrees. As you move east from the prime meridian, the values of the meridians increase. Therefore, the meridians from the prime meridian east to the international dateline are assigned values ranging from 0 to 180 degrees east.

Explanation

Meridians are imaginary lines that run from the North Pole to the South Pole and are used to measure longitude. The prime meridian is the starting point for measuring longitude and is assigned a value of 0 degrees. As you move east from the prime meridian, the values of the meridians increase. Therefore, the meridians from the prime meridian east to the international dateline are assigned values ranging from 0 to 180 degrees east.

57. The configuration of the onboard weapons can be described in the

Release table

Stores table

Gravity table

Action point table

The correct answer is "stores table". The configuration of the onboard weapons, such as their types, quantities, and locations, can be described in the stores table. This table contains information about the available weapons and their storage locations on the aircraft. It helps in managing and tracking the inventory of weapons and ensures that the correct weapons are loaded onto the aircraft before a mission. The stores table is an essential reference for weapon selection and deployment during aircraft operations.

Explanation

The correct answer is "stores table". The configuration of the onboard weapons, such as their types, quantities, and locations, can be described in the stores table. This table contains information about the available weapons and their storage locations on the aircraft. It helps in managing and tracking the inventory of weapons and ensures that the correct weapons are loaded onto the aircraft before a mission. The stores table is an essential reference for weapon selection and deployment during aircraft operations.

58. Which is vital to the performance of the inertial navigation system?

Operating temperature

Operating power

Operating pressure

Operating impedance

The operating temperature is vital to the performance of the inertial navigation system because it affects the accuracy and reliability of the system. Inertial navigation systems rely on measurements of accelerations and rotations to determine position and orientation. Changes in temperature can affect the performance of the sensors and components used in the system, leading to errors in the measurements. Therefore, maintaining a stable and suitable operating temperature is crucial for the proper functioning of the inertial navigation system.

Explanation

The operating temperature is vital to the performance of the inertial navigation system because it affects the accuracy and reliability of the system. Inertial navigation systems rely on measurements of accelerations and rotations to determine position and orientation. Changes in temperature can affect the performance of the sensors and components used in the system, leading to errors in the measurements. Therefore, maintaining a stable and suitable operating temperature is crucial for the proper functioning of the inertial navigation system.

59. How many radio-frequency signals are transmitted from each GPS satellite?

Three

One

Four

Two

Each GPS satellite transmits two radio-frequency signals. This is because GPS satellites use two different frequencies, L1 and L2, to transmit signals. The L1 frequency is used for civilian applications, while the L2 frequency is used for military applications. By transmitting two signals, GPS satellites ensure that both civilian and military users can receive accurate positioning and timing information.

Explanation

Each GPS satellite transmits two radio-frequency signals. This is because GPS satellites use two different frequencies, L1 and L2, to transmit signals. The L1 frequency is used for civilian applications, while the L2 frequency is used for military applications. By transmitting two signals, GPS satellites ensure that both civilian and military users can receive accurate positioning and timing information.

60. What is the transmitted frequency when an HF radio control is set to 27.5 MHz, the signal is modulated by a 1000-hertz tone, and lower sideband mode is selected

27.499 MHz

27.501 MHz

27.600 MHz

26.500 MHz

When a signal is modulated by a 1000-hertz tone in lower sideband mode, the transmitted frequency is calculated by subtracting the frequency of the tone from the carrier frequency. In this case, the carrier frequency is 27.5 MHz and the tone frequency is 1000 Hz. Therefore, the transmitted frequency would be 27.5 MHz - 1000 Hz = 27.499 MHz.

Explanation

When a signal is modulated by a 1000-hertz tone in lower sideband mode, the transmitted frequency is calculated by subtracting the frequency of the tone from the carrier frequency. In this case, the carrier frequency is 27.5 MHz and the tone frequency is 1000 Hz. Therefore, the transmitted frequency would be 27.5 MHz - 1000 Hz = 27.499 MHz.

61. The dimensions of a waveguide determine the waveguide's

Frequency and power-handling capability

Radiation loss and frequency

VSWR and power-handling ability

Frequency phase shift and power loss

The dimensions of a waveguide determine its frequency and power-handling capability. This is because the size and shape of the waveguide directly affect the wavelengths of the signals that can propagate through it. A larger waveguide can accommodate lower frequency signals, while a smaller waveguide is suitable for higher frequency signals. Additionally, the dimensions of the waveguide also determine its power handling capability. A larger waveguide can handle higher power levels without suffering from excessive losses or damage. Therefore, the dimensions of a waveguide play a crucial role in determining its frequency range and power-handling capability.

Explanation

The dimensions of a waveguide determine its frequency and power-handling capability. This is because the size and shape of the waveguide directly affect the wavelengths of the signals that can propagate through it. A larger waveguide can accommodate lower frequency signals, while a smaller waveguide is suitable for higher frequency signals. Additionally, the dimensions of the waveguide also determine its power handling capability. A larger waveguide can handle higher power levels without suffering from excessive losses or damage. Therefore, the dimensions of a waveguide play a crucial role in determining its frequency range and power-handling capability.

62. A receiving radio antenna receivers radio-frequency signals by

Accepting and amplifying the minute current

Electromagnetic fields impressing a voltage across the antenna, thus causing current to flow

Removing the radio-frequency carrier wave

Converting energy to magnetic and electrical fields of force

The correct answer is "electromagnetic fields impressing a voltage across the antenna, thus causing current to flow." When a radio antenna receives radio-frequency signals, the electromagnetic fields from the signals induce a voltage across the antenna. This voltage causes current to flow through the antenna, which is then amplified and processed to extract the desired information from the signals.

Explanation

The correct answer is "electromagnetic fields impressing a voltage across the antenna, thus causing current to flow." When a radio antenna receives radio-frequency signals, the electromagnetic fields from the signals induce a voltage across the antenna. This voltage causes current to flow through the antenna, which is then amplified and processed to extract the desired information from the signals.

63. In a frequency-shift radar system, the Doppler principle makes it possible to instantaneously sense and measure

Altitude and ground track

Target elevation and speed

Magnetic heading and altitude

Groundspeed and drift angle

The Doppler principle in a frequency-shift radar system allows for the measurement of groundspeed and drift angle. By analyzing the frequency shift of the radar signal reflected off a moving target, the system can determine the target's velocity relative to the ground (groundspeed) and the angle at which it is drifting from its intended path (drift angle). This information is crucial for various applications, such as aviation and maritime navigation, where knowledge of an object's speed and direction of movement is essential for safety and efficiency.

Explanation

The Doppler principle in a frequency-shift radar system allows for the measurement of groundspeed and drift angle. By analyzing the frequency shift of the radar signal reflected off a moving target, the system can determine the target's velocity relative to the ground (groundspeed) and the angle at which it is drifting from its intended path (drift angle). This information is crucial for various applications, such as aviation and maritime navigation, where knowledge of an object's speed and direction of movement is essential for safety and efficiency.

64. The VSWR is determined by comparing the radar's

Transmitter power to the transmitter frequency

Reflected power to the receiver sensitivity

Reflected power to the transmitter power

Transmitter power to the receiver sensitivity

The VSWR (Voltage Standing Wave Ratio) is a measure of how efficiently power is transmitted from a radar's transmitter to its antenna. It is determined by comparing the amount of power reflected back from the antenna (reflected power) to the amount of power delivered to the antenna (transmitter power). A high VSWR indicates that a significant portion of the transmitted power is being reflected back, resulting in inefficient power transfer. Therefore, the correct answer is "reflected power to the transmitter power."

Explanation

The VSWR (Voltage Standing Wave Ratio) is a measure of how efficiently power is transmitted from a radar's transmitter to its antenna. It is determined by comparing the amount of power reflected back from the antenna (reflected power) to the amount of power delivered to the antenna (transmitter power). A high VSWR indicates that a significant portion of the transmitted power is being reflected back, resulting in inefficient power transfer. Therefore, the correct answer is "reflected power to the transmitter power."

65. An advantage of the remote HAVE QUICK II configuration over the panel-mount cnfiguration in an aircraft is it

Reduces cost by using existing aircraft wiring

Can be used with a remote channel indicator

Can be used with a UHF direction finding system

Is more convenient for maintenance

The advantage of the remote HAVE QUICK II configuration over the panel-mount configuration in an aircraft is that it reduces cost by using existing aircraft wiring. This means that there is no need for additional wiring installation, saving both time and money. By utilizing the existing wiring, the remote configuration can be easily integrated into the aircraft's system without significant modifications or expenses.

Explanation

The advantage of the remote HAVE QUICK II configuration over the panel-mount configuration in an aircraft is that it reduces cost by using existing aircraft wiring. This means that there is no need for additional wiring installation, saving both time and money. By utilizing the existing wiring, the remote configuration can be easily integrated into the aircraft's system without significant modifications or expenses.

66. What inertial navigation unit mode continuously tracks aircraft position with respect to the point of origin and destination?

Air align

Stored heading align

Navigate

Precision align

The correct answer is "Navigate" because this mode continuously tracks the aircraft's position with respect to the point of origin and destination. It allows the aircraft to determine its current location and navigate along a desired route. The other options, such as "Air align," "Stored heading align," and "Precision align," do not specifically refer to tracking the aircraft's position in relation to the origin and destination.

Explanation

The correct answer is "Navigate" because this mode continuously tracks the aircraft's position with respect to the point of origin and destination. It allows the aircraft to determine its current location and navigate along a desired route. The other options, such as "Air align," "Stored heading align," and "Precision align," do not specifically refer to tracking the aircraft's position in relation to the origin and destination.

67. Which radar system can only detect objects approaching or moving away from the receiver?

Frequency-modulation

Pulse-modulation

Beacon

Frequency-shift

Frequency-shift radar systems can only detect objects that are approaching or moving away from the receiver. This is because frequency-shift radar works by measuring the change in frequency of the reflected signal, which occurs when an object is moving towards or away from the radar. This type of radar is commonly used in applications such as speed measurement or Doppler radar systems.

Explanation

Frequency-shift radar systems can only detect objects that are approaching or moving away from the receiver. This is because frequency-shift radar works by measuring the change in frequency of the reflected signal, which occurs when an object is moving towards or away from the radar. This type of radar is commonly used in applications such as speed measurement or Doppler radar systems.

68. The screen display on newer types of pulse-modulation radar indicators is called

A sweep

A map

The spot

A pulse

The screen display on newer types of pulse-modulation radar indicators is called "a map" because it provides a visual representation of the surrounding area. This display shows various geographical features, targets, and other relevant information in a graphical format, allowing the radar operator to easily interpret and analyze the data. The term "map" accurately describes this visual representation as it resembles a traditional map, providing a comprehensive overview of the radar's surroundings.

Explanation

The screen display on newer types of pulse-modulation radar indicators is called "a map" because it provides a visual representation of the surrounding area. This display shows various geographical features, targets, and other relevant information in a graphical format, allowing the radar operator to easily interpret and analyze the data. The term "map" accurately describes this visual representation as it resembles a traditional map, providing a comprehensive overview of the radar's surroundings.

69. The naviagtional system of GPS has a time accuracy to

50 nanoseconds

200 nanoseconds

100 nanoseconds

150 nanoseconds

The correct answer is 100 nanoseconds. The Global Positioning System (GPS) has a time accuracy of 100 nanoseconds. This means that the GPS system can determine the time with a precision of 100 nanoseconds, which is a very small unit of time. This high level of accuracy is necessary for precise positioning and navigation calculations performed by the GPS system.

Explanation

The correct answer is 100 nanoseconds. The Global Positioning System (GPS) has a time accuracy of 100 nanoseconds. This means that the GPS system can determine the time with a precision of 100 nanoseconds, which is a very small unit of time. This high level of accuracy is necessary for precise positioning and navigation calculations performed by the GPS system.

70. What radar set component provides stabilized pitch and roll reference data for control of antenna orientation, despite changes in aircraft attitude?

CN-221A

RT-289G

AM-853B

C-1242A

The CN-221A radar set component provides stabilized pitch and roll reference data for control of antenna orientation, despite changes in aircraft attitude.

Explanation

The CN-221A radar set component provides stabilized pitch and roll reference data for control of antenna orientation, despite changes in aircraft attitude.

71. If the external blower for an ARC-190 HF radio system is overheating, it causes a RT fault and

Causes the RT fault light to turn off

Keeps the coupler from tuning

Keeps the transmitter from functioning

Reduces the external blower speed

If the external blower for an ARC-190 HF radio system is overheating, it keeps the transmitter from functioning. This means that the transmitter is unable to operate properly or transmit any signals. The overheating of the external blower affects the overall functionality of the radio system and prevents the transmitter from performing its intended function.

Explanation

If the external blower for an ARC-190 HF radio system is overheating, it keeps the transmitter from functioning. This means that the transmitter is unable to operate properly or transmit any signals. The overheating of the external blower affects the overall functionality of the radio system and prevents the transmitter from performing its intended function.

72. To accurately locate an object in space by radar pulses, you need to know the

Altitude and speed

Range and direction

Altitude and range

Speed and direction

To accurately locate an object in space by radar pulses, you need to know the range and direction. Range refers to the distance between the radar and the object, while direction refers to the angle at which the object is located relative to the radar. By measuring the time it takes for the radar pulses to travel to the object and back, the range can be determined. The direction can be calculated by measuring the angle at which the radar antenna is pointing when it receives the reflected pulses from the object. Therefore, knowing the range and direction is essential for accurately locating an object in space using radar pulses.

Explanation

To accurately locate an object in space by radar pulses, you need to know the range and direction. Range refers to the distance between the radar and the object, while direction refers to the angle at which the object is located relative to the radar. By measuring the time it takes for the radar pulses to travel to the object and back, the range can be determined. The direction can be calculated by measuring the angle at which the radar antenna is pointing when it receives the reflected pulses from the object. Therefore, knowing the range and direction is essential for accurately locating an object in space using radar pulses.

73. The frequencies created by the heterodyining process in an apmplitude-modulated transmitter modulator are the

Sum of the two original frequncies and the two original frequencies

Difference between the two original frequencies and the two original frequencies

Sum of and difference between the two original frequencies

Two original frequencies

The correct answer is the sum of and difference between the two original frequencies. In the heterodyning process of an amplitude-modulated transmitter modulator, two original frequencies are combined. The sum of these frequencies creates an upper sideband frequency, while the difference between them creates a lower sideband frequency. Therefore, the frequencies created by the heterodyning process are the sum of and difference between the two original frequencies.

Explanation

The correct answer is the sum of and difference between the two original frequencies. In the heterodyning process of an amplitude-modulated transmitter modulator, two original frequencies are combined. The sum of these frequencies creates an upper sideband frequency, while the difference between them creates a lower sideband frequency. Therefore, the frequencies created by the heterodyning process are the sum of and difference between the two original frequencies.

74. The purpose of the ARN-151 receiver unit is to

Process the intermediate-frequency signal and calculate it into a navigation solution

Process the radio-frequency signal and calculate it into a navigation solution

Demodulate the radio-frequency signal to produce an audio signal

Demodulate the intermediate-frequency signal to produce an audio signal

The ARN-151 receiver unit is designed to process the intermediate-frequency signal, which is a signal that has been down-converted from the radio-frequency signal. By processing this intermediate-frequency signal, the receiver unit is able to calculate it into a navigation solution, which likely includes determining the position, velocity, and other relevant information for navigation purposes. This suggests that the receiver unit is responsible for analyzing and interpreting the incoming signal to provide accurate navigation data.

Explanation

The ARN-151 receiver unit is designed to process the intermediate-frequency signal, which is a signal that has been down-converted from the radio-frequency signal. By processing this intermediate-frequency signal, the receiver unit is able to calculate it into a navigation solution, which likely includes determining the position, velocity, and other relevant information for navigation purposes. This suggests that the receiver unit is responsible for analyzing and interpreting the incoming signal to provide accurate navigation data.

75. To achieve amplitude modulation, what device is used to ensure the output signal contains frequencies not present in the input signal?

Linear amplifier

Nonlinear amplifier

Balanced amplifier

Power amplifier

A nonlinear amplifier is used to achieve amplitude modulation by introducing frequencies that are not present in the input signal. Unlike a linear amplifier, which amplifies the input signal without introducing any new frequencies, a nonlinear amplifier alters the shape of the input signal, causing harmonics and intermodulation products to be generated. These additional frequencies are then combined with the original signal to create the desired amplitude modulated output signal.

Explanation

A nonlinear amplifier is used to achieve amplitude modulation by introducing frequencies that are not present in the input signal. Unlike a linear amplifier, which amplifies the input signal without introducing any new frequencies, a nonlinear amplifier alters the shape of the input signal, causing harmonics and intermodulation products to be generated. These additional frequencies are then combined with the original signal to create the desired amplitude modulated output signal.

76. A transmitting radio antenna is considered to be a transducer because it

Has electromagnetic fields that impress a voltage to be transmitted

Creates current oscillations to induce radio-frequency energy

Converts energy to magnetic and electrical fields of force

Transmits radio-frequency energy to distant locations

A transmitting radio antenna is considered to be a transducer because it converts energy to magnetic and electrical fields of force. Transducers are devices that convert one form of energy into another. In the case of a radio antenna, it takes electrical energy and converts it into electromagnetic fields, which are composed of magnetic and electrical fields. These fields carry the radio-frequency energy that is transmitted to distant locations.

Explanation

A transmitting radio antenna is considered to be a transducer because it converts energy to magnetic and electrical fields of force. Transducers are devices that convert one form of energy into another. In the case of a radio antenna, it takes electrical energy and converts it into electromagnetic fields, which are composed of magnetic and electrical fields. These fields carry the radio-frequency energy that is transmitted to distant locations.

77. Which is not a basic inertial navigation system component?

Indicator

Computer

Integrator

Accelerometer

An inertial navigation system (INS) is a navigation aid that uses accelerometers and gyroscopes to determine the position, orientation, and velocity of a moving object. The components of an INS include a computer, integrator, and accelerometer. The computer processes the data from the sensors, the integrator combines the data to calculate the object's position and velocity, and the accelerometer measures the object's acceleration. However, an indicator is not a basic component of an INS. An indicator is a display device that shows the information calculated by the INS, such as the object's position, heading, or speed.

Explanation

An inertial navigation system (INS) is a navigation aid that uses accelerometers and gyroscopes to determine the position, orientation, and velocity of a moving object. The components of an INS include a computer, integrator, and accelerometer. The computer processes the data from the sensors, the integrator combines the data to calculate the object's position and velocity, and the accelerometer measures the object's acceleration. However, an indicator is not a basic component of an INS. An indicator is a display device that shows the information calculated by the INS, such as the object's position, heading, or speed.

78. The part of the radar set's low observable antenna that is addressed to steer the radio-frequency beam is the

Radio-frequency roll resolver

Radio-frequency quadrant manifolds

Radio-frequency monopulse comparator

Phase control modules

The phase control modules are responsible for steering the radio-frequency beam in the radar set's low observable antenna. These modules adjust the phase of the radio-frequency signals to control the direction of the beam. The other options, such as the radio-frequency roll resolver, radio-frequency quadrant manifolds, and radio-frequency monopulse comparator, do not have the specific function of steering the beam.

Explanation

The phase control modules are responsible for steering the radio-frequency beam in the radar set's low observable antenna. These modules adjust the phase of the radio-frequency signals to control the direction of the beam. The other options, such as the radio-frequency roll resolver, radio-frequency quadrant manifolds, and radio-frequency monopulse comparator, do not have the specific function of steering the beam.

79. To which item does the radar set's dual-channel beam steering controller selectively send digital phasing and polarization commands

Roll resolver power supply

Phase control module power supple

Roll electronics assembly

Phase control module

The radar set's dual-channel beam steering controller selectively sends digital phasing and polarization commands to the Phase control module.

Explanation

The radar set's dual-channel beam steering controller selectively sends digital phasing and polarization commands to the Phase control module.

80. Which radar application is used primarily as an aid to navigation?

Terrain avoidance

Ground mapping

Terrain-following

Search

The radar application used primarily as an aid to navigation is "Search." Search radar is designed to detect and locate objects such as ships, aircraft, or other navigational aids over a wide area. It is commonly used in maritime and aviation industries to assist in navigation and ensure safety by providing information about the presence and location of nearby objects.

Explanation

The radar application used primarily as an aid to navigation is "Search." Search radar is designed to detect and locate objects such as ships, aircraft, or other navigational aids over a wide area. It is commonly used in maritime and aviation industries to assist in navigation and ensure safety by providing information about the presence and location of nearby objects.

81. Which GPS LRU nulls out (decreases) the unwanted signal by vector addition of all signal inputs?

Antenna controller

Antenna

Receiver

Antenna amplifier

The correct answer is the Antenna controller. The antenna controller is responsible for nulling out or decreasing the unwanted signal by vector addition of all signal inputs. It adjusts the position and orientation of the antenna to optimize the reception and minimize interference from unwanted signals. The antenna itself receives the signals, the receiver processes the signals, and the antenna amplifier amplifies the signals, but it is the antenna controller that actively nulls out the unwanted signal.

Explanation

The correct answer is the Antenna controller. The antenna controller is responsible for nulling out or decreasing the unwanted signal by vector addition of all signal inputs. It adjusts the position and orientation of the antenna to optimize the reception and minimize interference from unwanted signals. The antenna itself receives the signals, the receiver processes the signals, and the antenna amplifier amplifies the signals, but it is the antenna controller that actively nulls out the unwanted signal.

82. The frequency range of the ARC-186 VHF radio receiver in the AM mode is from

116 to 151.975 MHz

38 to 87.975 MHz

108 to 151.975 MHz

30 to 87.975 MHz

The correct answer is 108 to 151.975 MHz. This is the frequency range of the ARC-186 VHF radio receiver in the AM mode. The receiver is able to pick up frequencies in this range, allowing for communication within this frequency band.

Explanation

The correct answer is 108 to 151.975 MHz. This is the frequency range of the ARC-186 VHF radio receiver in the AM mode. The receiver is able to pick up frequencies in this range, allowing for communication within this frequency band.

83. Two fundamental sections of the frequency-modulated receiver that are electrically different from those in the amplitude-modulated receiver are the

Limiter and audio amplifier

Radio-frequency amplifier and discriminator

Local oscillator and detector

Discriminator and limiter

In a frequency-modulated receiver, the discriminator and limiter are electrically different from those in an amplitude-modulated receiver. The discriminator is responsible for detecting and demodulating the frequency variations in the received signal, converting them into an audio signal. On the other hand, the limiter is used to limit the amplitude of the signal, ensuring that any variations in signal strength do not affect the demodulation process. These components play crucial roles in the FM receiver's ability to accurately extract and reproduce the original audio signal.

Explanation

In a frequency-modulated receiver, the discriminator and limiter are electrically different from those in an amplitude-modulated receiver. The discriminator is responsible for detecting and demodulating the frequency variations in the received signal, converting them into an audio signal. On the other hand, the limiter is used to limit the amplitude of the signal, ensuring that any variations in signal strength do not affect the demodulation process. These components play crucial roles in the FM receiver's ability to accurately extract and reproduce the original audio signal.

84. In a frequency-modulated signal, the amount of frequency modulation is controlled by the modulating signal's

Phase

Rate

Amplitude

Frequency

In a frequency-modulated signal, the amount of frequency modulation is controlled by the modulating signal's amplitude. This means that the variation in the amplitude of the modulating signal directly affects the amount of frequency deviation in the carrier signal. As the amplitude of the modulating signal increases, the frequency deviation of the carrier signal also increases, resulting in a higher frequency modulation. Conversely, a decrease in the amplitude of the modulating signal leads to a lower frequency modulation. Therefore, the amplitude of the modulating signal plays a crucial role in controlling the amount of frequency modulation in a frequency-modulated signal.

Explanation

In a frequency-modulated signal, the amount of frequency modulation is controlled by the modulating signal's amplitude. This means that the variation in the amplitude of the modulating signal directly affects the amount of frequency deviation in the carrier signal. As the amplitude of the modulating signal increases, the frequency deviation of the carrier signal also increases, resulting in a higher frequency modulation. Conversely, a decrease in the amplitude of the modulating signal leads to a lower frequency modulation. Therefore, the amplitude of the modulating signal plays a crucial role in controlling the amount of frequency modulation in a frequency-modulated signal.

85. The radio-frequency line that has uniform capacitance between the conductors throughout the length of the line is the

Flexible coaxial line

Parallel two-wire

Air coaxial line

Shielded pair

A shielded pair is the radio-frequency line that has uniform capacitance between the conductors throughout the length of the line. In a shielded pair, two insulated wires are twisted together and encased in a metallic shield, which helps to minimize electromagnetic interference. The uniform capacitance between the conductors ensures that the line has consistent impedance along its length, allowing for efficient transmission of radio-frequency signals.

Explanation

A shielded pair is the radio-frequency line that has uniform capacitance between the conductors throughout the length of the line. In a shielded pair, two insulated wires are twisted together and encased in a metallic shield, which helps to minimize electromagnetic interference. The uniform capacitance between the conductors ensures that the line has consistent impedance along its length, allowing for efficient transmission of radio-frequency signals.

86. The frequency range of the ARC-186 VHF radio receiver in the FM mode is from

116 to 151.975 MHz

108 to 151.975 MHz

30 to 87.975 MHz

38 to 87.975 MHz

The correct answer is 30 to 87.975 MHz. This range indicates the frequency at which the ARC-186 VHF radio receiver operates in FM mode. It suggests that the receiver can receive signals within this frequency range, allowing for communication and reception of VHF signals within this specific range.

Explanation

The correct answer is 30 to 87.975 MHz. This range indicates the frequency at which the ARC-186 VHF radio receiver operates in FM mode. It suggests that the receiver can receive signals within this frequency range, allowing for communication and reception of VHF signals within this specific range.

87. When is the radar altimeter height indicator OFF flag not displayed?

The height indicator is turned off

Aircraft altitude is above 5,000 feet above ground-level

The radar altimeter is tracking the terrain

Power to the radar altimeter is lost

The radar altimeter height indicator OFF flag is not displayed when the radar altimeter is tracking the terrain. This means that the altimeter is functioning properly and providing accurate readings of the aircraft's height above the ground. The flag is only displayed when the height indicator is turned off, the aircraft altitude is above 5,000 feet above ground-level, or power to the radar altimeter is lost.

Explanation

The radar altimeter height indicator OFF flag is not displayed when the radar altimeter is tracking the terrain. This means that the altimeter is functioning properly and providing accurate readings of the aircraft's height above the ground. The flag is only displayed when the height indicator is turned off, the aircraft altitude is above 5,000 feet above ground-level, or power to the radar altimeter is lost.

88. A major draw back in using a SSB receiver over an AM receiver is the

Weak signals are easy to detect in the AM receiver

Need for critical frequency stability

SSB receiver has a narrower bandpass

AM receiver requires only one oscillator circuit

The major drawback in using a SSB receiver over an AM receiver is the need for critical frequency stability. Unlike an AM receiver, which can tolerate some frequency variation, a SSB receiver requires precise frequency stability in order to properly demodulate the single sideband signal. This is because any frequency drift or instability can result in distortion and loss of intelligibility in the received signal. Therefore, maintaining critical frequency stability is crucial when using a SSB receiver.

Explanation

The major drawback in using a SSB receiver over an AM receiver is the need for critical frequency stability. Unlike an AM receiver, which can tolerate some frequency variation, a SSB receiver requires precise frequency stability in order to properly demodulate the single sideband signal. This is because any frequency drift or instability can result in distortion and loss of intelligibility in the received signal. Therefore, maintaining critical frequency stability is crucial when using a SSB receiver.

89. In a single-sideband transmitter, the balance modulator's output consists of the

Lower sideband only

Upper sideband only

Carrier and upper and lower sidebands

Upper and lower sidebands

In a single-sideband transmitter, the balance modulator is responsible for suppressing one of the sidebands and the carrier signal, resulting in the transmission of only one sideband. However, the upper and lower sidebands are both present in the output of the balance modulator, which means that the correct answer is upper and lower sidebands.

Explanation

In a single-sideband transmitter, the balance modulator is responsible for suppressing one of the sidebands and the carrier signal, resulting in the transmission of only one sideband. However, the upper and lower sidebands are both present in the output of the balance modulator, which means that the correct answer is upper and lower sidebands.

90. In an amplitude-modulated receiver, the detector circuit responds only to the

Frequency variations of the intermediate-frequency signal

Pulse width of the intermediate-frequency signal

Rate of frequency deviation of the intermediate-frequency signal

Amplitude variations of the intermediate-frequency signal

In an amplitude-modulated receiver, the detector circuit is designed to respond to the amplitude variations of the intermediate-frequency signal. This is because in amplitude modulation, the information is encoded in the variations of the signal's amplitude. Therefore, the detector circuit is responsible for extracting this information from the intermediate-frequency signal by detecting and decoding the amplitude variations.

Explanation

In an amplitude-modulated receiver, the detector circuit is designed to respond to the amplitude variations of the intermediate-frequency signal. This is because in amplitude modulation, the information is encoded in the variations of the signal's amplitude. Therefore, the detector circuit is responsible for extracting this information from the intermediate-frequency signal by detecting and decoding the amplitude variations.

91. The radar altimeter TEST button provides the capability for testing the low-altitude fly-up circuits in the

Radar data terminals and terrain-following avionic control units

Radar data terminals and ground navigation avionic control units

Ground navigation avionic control units and weapons delivery avionic control units

Terrain-following avionic control units and delivery avionic control units

The radar altimeter TEST button is used for testing the low-altitude fly-up circuits in the radar data terminals and terrain-following avionic control units. This suggests that the button is specifically designed to test and ensure the proper functioning of these components in relation to low-altitude fly-up operations. The other options do not mention the radar data terminals and terrain-following avionic control units, indicating that they are not relevant to the function of the TEST button.

Explanation

The radar altimeter TEST button is used for testing the low-altitude fly-up circuits in the radar data terminals and terrain-following avionic control units. This suggests that the button is specifically designed to test and ensure the proper functioning of these components in relation to low-altitude fly-up operations. The other options do not mention the radar data terminals and terrain-following avionic control units, indicating that they are not relevant to the function of the TEST button.

92. In a signal-sideband system, which mode of operation transmits both sidebands and deletes the carrier?

Independent sideband

Amplitude-modulate equivalent

Single-sideband suppressed carrier

Single-sideband transmission

In a signal-sideband system, the mode of operation that transmits both sidebands and deletes the carrier is called independent sideband. This mode of operation allows for efficient use of bandwidth by eliminating the carrier signal while still transmitting both sidebands. This is achieved by using a modulator that separates the original signal into upper and lower sidebands and then combining them to form the independent sideband signal.

Explanation

In a signal-sideband system, the mode of operation that transmits both sidebands and deletes the carrier is called independent sideband. This mode of operation allows for efficient use of bandwidth by eliminating the carrier signal while still transmitting both sidebands. This is achieved by using a modulator that separates the original signal into upper and lower sidebands and then combining them to form the independent sideband signal.

93. What schedules task execution that selects the inertial navigation unit's mode, performs mode initialization, provides geographic-oriented system outputs (including data representing Earth radii and gravity vectors), monitors the INU's performance, and reports system failures?

Avionics operational flight program

Built-in test function

Preprocessor formatting software

Operational flight program

The operational flight program is responsible for scheduling task execution, selecting the inertial navigation unit's mode, performing mode initialization, providing geographic-oriented system outputs, monitoring the INU's performance, and reporting system failures. It is the software that controls and manages the operation of the avionics system during flight.

Explanation

The operational flight program is responsible for scheduling task execution, selecting the inertial navigation unit's mode, performing mode initialization, providing geographic-oriented system outputs, monitoring the INU's performance, and reporting system failures. It is the software that controls and manages the operation of the avionics system during flight.

94. Which VHF radio system has the best chance of receiving a signal from a station located beyond the horizon?

Super-high frequency

Very-high frequency frequency modulation

Very-high frequency amplitude modulation

Ultra-high frequency

Very-high frequency frequency modulation (VHF FM) has the best chance of receiving a signal from a station located beyond the horizon. This is because VHF FM signals have a longer range and better ability to penetrate obstacles compared to other VHF radio systems. The frequency modulation allows for a more efficient use of the available bandwidth and reduces interference, resulting in clearer and more reliable signal reception. Additionally, VHF FM systems are commonly used in aviation and marine communications, where long-range communication is essential.

Explanation

Very-high frequency frequency modulation (VHF FM) has the best chance of receiving a signal from a station located beyond the horizon. This is because VHF FM signals have a longer range and better ability to penetrate obstacles compared to other VHF radio systems. The frequency modulation allows for a more efficient use of the available bandwidth and reduces interference, resulting in clearer and more reliable signal reception. Additionally, VHF FM systems are commonly used in aviation and marine communications, where long-range communication is essential.

95. The purpose of the keyed automatic gain control gate while the radar altimeter is in track mode is to

Generate internal range voltages proportional to aircraft altitude

Control the processing of the ground returns

Encompass and lock-on to the return video pulses

Be timed to overlap return pulse leading edge

The purpose of the keyed automatic gain control gate while the radar altimeter is in track mode is to encompass and lock-on to the return video pulses. This means that the gate is designed to capture and focus on the specific pulses of video signals that are received as echoes from the ground. By encompassing and locking onto these pulses, the radar altimeter can accurately measure the altitude of the aircraft based on the time it takes for the pulses to return. This helps in providing precise altitude information for the aircraft during track mode operation.

Explanation

The purpose of the keyed automatic gain control gate while the radar altimeter is in track mode is to encompass and lock-on to the return video pulses. This means that the gate is designed to capture and focus on the specific pulses of video signals that are received as echoes from the ground. By encompassing and locking onto these pulses, the radar altimeter can accurately measure the altitude of the aircraft based on the time it takes for the pulses to return. This helps in providing precise altitude information for the aircraft during track mode operation.

96. The AN/ARC-210 receiver/transmitter does not provide

Half-duplex, two-way communications of normal and secure voice frequency-modulated signals

Transmit-only mode of operation of normal and secure voice from 108.000 to 117.9975 MHz AM

Receive-only mode of operation of normal and secure voice from 108.000 to 117.9975 MHz AM

Half-duplex, two-way communications of normal and secure voice AM signals

The correct answer is "transmit-only mode of operation of normal and secure voice from 108.000 to 117.9975 MHz AM". This means that the AN/ARC-210 receiver/transmitter is capable of transmitting normal and secure voice signals within the specified frequency range, but it does not have the capability to receive or engage in two-way communication.

Explanation

The correct answer is "transmit-only mode of operation of normal and secure voice from 108.000 to 117.9975 MHz AM". This means that the AN/ARC-210 receiver/transmitter is capable of transmitting normal and secure voice signals within the specified frequency range, but it does not have the capability to receive or engage in two-way communication.

97. The low-pass filter in the automatic frequency control circuitry of a frequency-modulated transmitter is designed to prevent

The lower sideband from being transmitted

The audio signal from the audio amplifier from tuning the reactance modulator

Correction voltage changes caused by the modulating signals

Carrier frequency feedback from tuning the reactance modulator

The low-pass filter in the automatic frequency control circuitry of a frequency-modulated transmitter is designed to prevent correction voltage changes caused by the modulating signals. This is because the modulating signals can introduce fluctuations in the voltage, which can affect the frequency of the carrier signal. By using a low-pass filter, the high-frequency components of the modulating signals are attenuated, allowing only the low-frequency components to pass through. This helps to stabilize the correction voltage and maintain a consistent carrier frequency.

Explanation

The low-pass filter in the automatic frequency control circuitry of a frequency-modulated transmitter is designed to prevent correction voltage changes caused by the modulating signals. This is because the modulating signals can introduce fluctuations in the voltage, which can affect the frequency of the carrier signal. By using a low-pass filter, the high-frequency components of the modulating signals are attenuated, allowing only the low-frequency components to pass through. This helps to stabilize the correction voltage and maintain a consistent carrier frequency.

98. On which frequencies can the ARC-186 VHF radio not transmit in the AM mode?

38 to 87.975 MHz

108 to 151.975 MHz

116 to 151.975 MHz

30 to 87.975 MHz

The ARC-186 VHF radio cannot transmit in the AM mode on frequencies ranging from 108 to 151.975 MHz.

Explanation

The ARC-186 VHF radio cannot transmit in the AM mode on frequencies ranging from 108 to 151.975 MHz.

99. The basic difference between the single-sideband receiver and a conventional superheterodyne receiver is the SSB receiver uses a

Special detector and carrier reinsertion oscillator

Discriminator and local oscillator circuit

Limiter and second mixer circuit

Carrier reinsertion oscillator and special mixer circuit

The basic difference between the single-sideband receiver and a conventional superheterodyne receiver is that the SSB receiver uses a special detector and carrier reinsertion oscillator. This means that the SSB receiver is able to extract the desired sideband signal from the received SSB signal and reinsert the carrier signal, allowing for demodulation and recovery of the original audio signal. In contrast, a conventional superheterodyne receiver typically uses a discriminator and local oscillator circuit to demodulate the signal and does not involve carrier reinsertion. The use of the special detector and carrier reinsertion oscillator in the SSB receiver enables efficient and accurate demodulation of the single-sideband signal.

Explanation

The basic difference between the single-sideband receiver and a conventional superheterodyne receiver is that the SSB receiver uses a special detector and carrier reinsertion oscillator. This means that the SSB receiver is able to extract the desired sideband signal from the received SSB signal and reinsert the carrier signal, allowing for demodulation and recovery of the original audio signal. In contrast, a conventional superheterodyne receiver typically uses a discriminator and local oscillator circuit to demodulate the signal and does not involve carrier reinsertion. The use of the special detector and carrier reinsertion oscillator in the SSB receiver enables efficient and accurate demodulation of the single-sideband signal.

100. In a frequency-modulated signal, the amount of separation between the sideband frequencies is equal to the

Rate of carrier swing

Carrier frequency

Amplitude of the modulating signal

Modulating frequency

In a frequency-modulated signal, the amount of separation between the sideband frequencies is equal to the modulating frequency. This means that the difference in frequency between the upper and lower sidebands is directly proportional to the frequency of the modulating signal. As the modulating frequency changes, the separation between the sidebands also changes accordingly. This is a fundamental characteristic of frequency modulation, where the modulating signal controls the frequency of the carrier wave.

Explanation

In a frequency-modulated signal, the amount of separation between the sideband frequencies is equal to the modulating frequency. This means that the difference in frequency between the upper and lower sidebands is directly proportional to the frequency of the modulating signal. As the modulating frequency changes, the separation between the sidebands also changes accordingly. This is a fundamental characteristic of frequency modulation, where the modulating signal controls the frequency of the carrier wave.