# Can You Pass This Aircraft Electrical System Test?

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Air transport is the fastest means of transportation, and it does not come with some dangers too. Being an electrical engineer is one thing, but being an aircraft electrical system engineer is another. This job requires more knowledge but picks some from the basics. These are the same questions you will see in the CBT, so try to know the answers as well. For the Multiple Choice, try to understand the answer rather than memorize it.

• 1.

### The polar axis is the

• A.

Circle equal distance from the poles

• B.

Axis about which the earth rotates

• C.

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

• D.

Axis about which the moon rotates

B. Axis about which the earth rotates
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.

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• 2.

### 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?

• A.

Parallel of latitude

• B.

Great circle

• C.

Meridian of longitude

• D.

Equator

B. 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.

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• 3.

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

• A.

Instrument landing

• B.

Aircraft landing

• C.

Geographic coordinate

• D.

C. Geographic coordinate
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.

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• 4.

### The prime meridian is the

• A.

Circle equal distance between the north and south poles

• B.

Meridian passing through Greenwich, England

• C.

Meridian designated the 180 degree meridian

• D.

Circle designated 0 degree latitude

B. Meridian passing through Greenwich, England
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.

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• 5.

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

• A.

0 to 90 degrees east

• B.

0 to 180 degrees west

• C.

0 to 90 degrees west

• D.

0 to 180 east

D. 0 to 180 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.

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• 6.

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

• A.

0 to 90 degrees east

• B.

0 to 90 degrees west

• C.

0 to 180 degrees west

• D.

0 to 180 degrees east

C. 0 to 180 degrees west
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.

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• 7.

### In navigation, the primary reference is

• A.

90 degrees

• B.

North

• C.

The equator

• D.

0 degrees

B. North
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.

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• 8.

### North on a compass rose is

• A.

90 degrees

• B.

270 degrees

• C.

180 degrees

• D.

0 degrees

D. 0 degrees
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.

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• 9.

### Relative bearing of an aircraft is the direction measured clockwise from

• A.

The aircraft heading to the object

• B.

True north to the object

• C.

0 degrees to the object

• D.

The object to true north

A. The aircraft heading to the object
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.

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• 10.

### The effect of wind on an aircraft is

• A.

Unimportant

• B.

Negligible

• C.

Significant

• D.

Slight

C. Significant
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.

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• 11.

### The sideward displacement of an aircraft by the wind is called

• A.

Deviation

• B.

Yaw

• C.

Groundspeed

• D.

Drift

D. Drift
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.

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• 12.

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

• A.

Airspeed

• B.

Velocity

• C.

Groundspeed

• D.

Drift

C. Groundspeed
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.

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• 13.

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

• A.

Drift correction

• B.

Ground speed correction

• C.

Airspeed correction

• D.

Wind disbursement

A. Drift correction
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.

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• 14.

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

• A.

Wind triangle

• B.

• C.

Destination chart

• D.

Flight path

A. Wind triangle
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.

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• 15.

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

• A.

Deviation lines

• B.

Agonic

• C.

Variation lines

• D.

Isogonic

D. Isogonic
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.

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• 16.

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

• A.

Hits the target

• B.

Overshoots the target

• C.

Falls to the side of the target

• D.

Falls short of the target

B. Overshoots the target
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.

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• 17.

### Air resistance causing a falling bomb to

• A.

Fall unpredictably

• B.

Lag

• C.

• D.

Fall rapid

B. Lag
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.

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• 18.

### A head wind causes a falling bomb to

• A.

Fall short of the target

• B.

Fall left or right of the target

• C.

Hit the target

• D.

Overshoot the target

A. 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.

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• 19.

### A cross wind causes a falling bomb to

• A.

Hit the target

• B.

Fall short of the target

• C.

Fall left or right of the target

• D.

Overshoot the target

C. Fall left or right of the target
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.

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• 20.

### The configuration of the onboard weapons can be described in the

• A.

Release table

• B.

Stores table

• C.

Gravity table

• D.

Action point table

B. Stores table
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.

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• 21.

### The preplanned flight route can be described in the

• A.

Stores table

• B.

Gravity table

• C.

Release table

• D.

Action point table

D. Action point table
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.

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• 22.

### Which is not a basic inertial navigation system component?

• A.

Indicator

• B.

Computer

• C.

Integrator

• D.

Accelerometer

A. Indicator
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.

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• 23.

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

• A.

Speed

• B.

Reference

• C.

Motion

• D.

Velocity

C. Motion
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.

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• 24.

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

• A.

Platform

• B.

Summing unit

• C.

Integrator

• D.

Computer

A. Platform
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.

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• 25.

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

• A.

• B.

• C.

Terrain-following avionics control unit

• D.

Doppler velocity sensor

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.

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• 26.

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

• A.

• B.

• C.

Terrain-following avionics control unit

• D.

Doppler velocity sensor

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.

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• 27.

### Which component is the central controller for the INU?

• A.

Stabilized platform

• B.

Platform electronics

• C.

Power supply

• D.

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.

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• 28.

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

• A.

• B.

Identify malfunctions within the inertial navigation unit

• C.

Indicate the normal operation of the inertial navigation unit

• D.

Provide inputs during checkout

B. Identify malfunctions within the inertial navigation unit
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.

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• 29.

### 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?

• A.

Avionics operational flight program

• B.

Built-in test function

• C.

Preprocessor formatting software

• D.

Operational flight program

D. Operational flight program
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.

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• 30.

### Which is vital to the performance of the inertial navigation system?

• A.

Operating temperature

• B.

Operating power

• C.

Operating pressure

• D.

Operating impedance

A. Operating temperature
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.

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• 31.

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

• A.

80 F

• B.

170 F

• C.

120 F

• D.

90 F

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

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• 32.

### 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?

• A.

AMUX

• B.

CMUX

• C.

DMUX

• D.

BMUX

A. AMUX
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.

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• 33.

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

• A.

With a slow descent at a constant velocity

• B.

Straight and level, and at a constant velocity

• C.

As normal; no special considerations are necessary

• D.

With a slow ascent at a constant velocity

B. Straight and level, and at a constant velocity
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.

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• 34.

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

• A.

Air align

• B.

• C.

Navigate

• D.

Precision align

C. Navigate
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.

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• 35.

### What INU mode is about 45 minutes in duration?

• A.

• B.

Precision align

• C.

Air align

• D.

Navigate

B. Precision align
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.

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• 36.

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

• A.

Global positioning system

• B.

Satellites

• C.

Monitor stations

• D.

Master control station

C. Monitor stations
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.

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• 37.

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

• A.

48 hours

• B.

24 hours

• C.

12 hours

• D.

6 hours

B. 24 hours
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.

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• 38.

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

• A.

Three

• B.

One

• C.

Four

• D.

Two

D. Two
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.

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• 39.

### The GPS has a three-dimensional position navigation accuracy of

• A.

16 meters

• B.

0.16 meters

• C.

1.6 meters

• D.

160 meters

A. 16 meters
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.

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• 40.

### The naviagtional system of GPS has a time accuracy to

• A.

50 nanoseconds

• B.

200 nanoseconds

• C.

100 nanoseconds

• D.

150 nanoseconds

C. 100 nanoseconds
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.

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• 41.

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

• A.

Antenna amplifier

• B.

Antenna controller

• C.

• D.

Antenna

D. Antenna
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.

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• 42.

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

• A.

Indicator control

• B.

• C.

Antenna controller

• D.

Mount

A. Indicator control
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.

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• 43.

### The purpose of the ARN-151 receiver unit is to

• A.

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

• B.

• C.

Demodulate the radio-frequency signal to produce an audio signal

• D.

Demodulate the intermediate-frequency signal to produce an audio signal

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

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• 44.

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

• A.

Position, altitude, and speed

• B.

Position, time, and almanac information

• C.

Altitude, time, and speed

• D.

Altitude, time, and almanac information

B. Position, time, and almanac information
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.

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• 45.

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

• A.

Antenna controller

• B.

Antenna

• C.

• D.

Antenna amplifier

A. Antenna controller
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.

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• 46.

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

• A.

Transmitter

• B.

Indicator

• C.

• D.

Antenna

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.

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• 47.

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

• A.

Beacon

• B.

Frequency-shift

• C.

Frequency-modulation

• D.

Pulse-modulation

D. Pulse-modulation
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.

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• 48.

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

• A.

Uses a different antenna than the receiver

• B.

Transmits on a different frequency

• C.

Shifts the frequency of the pulse

• D.

Is turned off after each pulse

D. Is turned off after each pulse
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.

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• 49.

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

• A.

Altitude and speed

• B.

Range and direction

• C.

Altitude and range

• D.

Speed and direction

B. Range and direction
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.

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• 50.

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

• A.

Frequency-modulation

• B.

Pulse-modulation

• C.

Beacon

• D.

Frequency-shift

D. Frequency-shift
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.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 03, 2010
Quiz Created by
Egramza

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