# US Airforce Airfield SySTEMs Quiz

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Are you an Airforce enthusiast? If yes, take the "US Airforce Airfield Systems Quiz" to see how familiar you are with the technical stuff of the USAF. The quiz has been meticulously curated to increase your knowledge-based, and questions are designed to help you gain practical knowledge of the Airsystems. Play this quiz to widen your knowledge reservoir about airfield systems. All the best!

• 1.

### The visibility measurement set, AN/GMQ–32, has how many main assemblies?

• A.

One.

• B.

Two.

• C.

Three.

• D.

Four.

C. Three.
Explanation
The visibility measurement set, AN/GMQ-32, has three main assemblies.

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• 2.

### The visibility measurement set, AN/GMQ–32, projector and receiver, are a maximum of how many feet apart?

• A.

200

• B.

300

• C.

400

• D.

500

D. 500
Explanation
The visibility measurement set, AN/GMQ-32, consists of a projector and receiver. The question is asking for the maximum distance in feet that these two components can be apart from each other. The correct answer is 500 feet.

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• 3.

### Where are the barometers/altimeters, AN/ML–102, usually located?

• A.

In a place with direct sunlight.

• B.

In a place with indirect sunlight.

• C.

In a place where the temperature changes.

• D.

In a place where the temperature is constant.

D. In a place where the temperature is constant.
Explanation
Barometers/altimeters, AN/ML-102, are usually located in a place where the temperature is constant. This is because temperature fluctuations can affect the accuracy of these instruments. By keeping them in a place with a constant temperature, the readings obtained from the barometers/altimeters will be more reliable and accurate.

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• 4.

### What is the range of wind speeds that can be measured by the automated meteorological station, AN/FMQ–19, wind sensor?

• A.

0 – 130 miles per hour (mph).

• B.

0 – 100 mph.

• C.

10 – 130 mph.

• D.

10 – 100 mph.

A. 0 – 130 miles per hour (mph).
Explanation
The range of wind speeds that can be measured by the automated meteorological station, AN/FMQ-19, wind sensor is 0 - 130 miles per hour (mph).

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• 5.

### What is the maximum number of cloud bases the automated meteorological station, AN/FMQ–19, ceilometer can detect?

• A.

One

• B.

Two

• C.

Three

• D.

Four

C. Three
Explanation
The automated meteorological station, AN/FMQ-19 ceilometer, can detect a maximum of three cloud bases. This means that it is capable of measuring and identifying the height of up to three different cloud layers in the atmosphere.

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• 6.

### What is the purpose of the blower located in the automated meteorological station, AN/FMQ–19, relative humidity/air temperature sensor?

• A.

Stop snow from accumulating around the indicator probe.

• B.

Maintain a steady air temperature for accurate measurements.

• C.

Prevent damage to electronic components during extremely hot weather.

• D.

Provide fresh air to the dewpoint indicator probe for accurate measurements.

D. Provide fresh air to the dewpoint indicator probe for accurate measurements.
Explanation
The purpose of the blower located in the automated meteorological station, AN/FMQ-19, relative humidity/air temperature sensor is to provide fresh air to the dewpoint indicator probe for accurate measurements. The blower helps to ensure that the air around the probe is constantly refreshed, preventing any stagnant air from affecting the accuracy of the measurements. This is important because accurate measurements of humidity and temperature are crucial in meteorology for forecasting weather conditions.

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• 7.

### How do the three barometer outputs provide barometric pressure data in the automated meteorological station, AN/FMQ–19?

• A.

The output with the highest value is used to determine station pressure.

• B.

The output with the lowest value is used to determine station pressure.

• C.

The three barometer output values are averaged in order to determine station pressure.

• D.

The three barometer output values are added together in order to determine station pressure

C. The three barometer output values are averaged in order to determine station pressure.
Explanation
The three barometer output values are averaged in order to determine station pressure. By taking the average of the three values, it helps to eliminate any potential outliers or errors in individual readings, providing a more accurate representation of the barometric pressure.

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• 8.

### What action occurs when freezing rain accumulates on the freezing-rain sensor probe in the automated meteorological station, AN/FMQ–19?

• A.

The probe’s vibrational frequency decreases.

• B.

The probe’s vibrational frequency increases.

• C.

The probe’s capacitance decreases.

• D.

The probe’s capacitance increases.

A. The probe’s vibrational frequency decreases.
Explanation
When freezing rain accumulates on the freezing-rain sensor probe in the automated meteorological station, it causes the probe's vibrational frequency to decrease.

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• 9.

### In the automated meteorological station, AN/FMQ–19, which sensor group normally contains a complete set of sensors?

• A.

Primary sensor group.

• B.

Midfield sensor group.

• C.

Secondary sensor group.

• D.

Mid-infrared pathogen sensor group.

A. Primary sensor group.
Explanation
The primary sensor group in the automated meteorological station, AN/FMQ-19, normally contains a complete set of sensors. This means that all the essential sensors required for measuring and monitoring weather parameters are included in this group. The primary sensor group plays a crucial role in providing accurate and reliable meteorological data, which is vital for weather forecasting and analysis.

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• 10.

### When would an automated meteorological station, AN/FMQ–19, midfield sensor group be installed?

• A.

When an airfield location must meet Category I criteria.

• B.

When an airfield location must meet Category II criteria.

• C.

When an airfield location must meet Category III criteria.

• D.

When an airfield location must meet Category IV criteria.

B. When an airfield location must meet Category II criteria.
Explanation
The automated meteorological station, AN/FMQ-19, midfield sensor group would be installed when an airfield location must meet Category II criteria. This suggests that the station is specifically designed to gather meteorological data for airfields that need to meet the requirements of Category II criteria.

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• 11.

### A typical air traffic control tower console is made up of how many operator positions in the enhanced terminal voice switch?

• A.

Three

• B.

Four

• C.

Five

• D.

Six

C. Five
Explanation
A typical air traffic control tower console is made up of five operator positions in the enhanced terminal voice switch.

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• 12.

### Where is the enhanced terminal voice switch maintenance position located?

• A.

In the bottom floor of the air traffic control (ATC) tower.

• B.

In the central equipment racks.

• C.

• D.

In the ATC tower cab.

B. In the central equipment racks.
Explanation
The enhanced terminal voice switch maintenance position is located in the central equipment racks. This means that the maintenance position is not in the bottom floor of the ATC tower, at the transmit/receive site, or in the ATC tower cab.

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• 13.

### What capabilities can be provided at the enhanced terminal voice switch maintenance position?

• A.

System monitor capability only.

• B.

The same as at any operator position.

• C.

All functions accept operator position monitor.

• D.

All functions accept active tower-to-aircraft channels.

B. The same as at any operator position.
Explanation
The correct answer is "The same as at any operator position." This means that the enhanced terminal voice switch maintenance position has the same capabilities as any other operator position. This implies that it can perform all the functions that an operator position can, including monitoring, system maintenance, and communication with active tower-to-aircraft channels.

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• 14.

### What piece of equipment is the primary means of communication control and the interface between the operator and central equipment in the enhanced terminal voice switch?

• A.

Operator communications unit.

• B.

Tower electronic device.

• C.

Operator control unit.

• D.

Touch entry display.

D. Touch entry display.
Explanation
The primary means of communication control and the interface between the operator and central equipment in the enhanced terminal voice switch is the touch entry display. This device allows the operator to input commands and control the communication system efficiently. It provides a user-friendly interface for the operator to interact with the central equipment, making it the most suitable option for this role.

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• 15.

### What operating system does the supervisor configuration terminal of the enhanced terminal voice switch use?

• A.

DOS.

• B.

Linux.

• C.

Windows 98.

• D.

Windows XP.

A. DOS.
Explanation
The supervisor configuration terminal of the enhanced terminal voice switch uses DOS as its operating system.

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• 16.

### Which enhanced terminal voice switch assembly is capable of changing system passwords and displaying system fault location?

• A.

Local position.

• B.

Flight data position.

• C.

Supervisory configuration terminal.

• D.

Configuration and control subsystem.

C. Supervisory configuration terminal.
Explanation
The supervisory configuration terminal is the enhanced terminal voice switch assembly that is capable of changing system passwords and displaying system fault location. This terminal is responsible for supervising and controlling the configuration and operation of the system. It has the necessary capabilities to manage passwords and provide fault location information, making it the correct answer to the question.

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• 17.

### Redundancy of the enhanced terminal voice switch is accomplished by allowing how many radio processor cards to be associated with each frequency?

• A.

Four.

• B.

Three.

• C.

Two.

• D.

One.

C. Two.
Explanation
The enhanced terminal voice switch achieves redundancy by allowing two radio processor cards to be associated with each frequency. This means that in case one card fails, the other card can still handle the communication on that frequency, ensuring uninterrupted service.

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• 18.

### Which enhanced terminal voice switch assembly is responsible for interfacing between the demarcation panel and radio processor cards?

• A.

• B.

• C.

Supervisory configuration terminal.

• D.

Explanation
The radio distribution panel is responsible for interfacing between the demarcation panel and radio processor cards. It is designed to distribute voice and data signals to various radio systems and provides a centralized control and monitoring interface. The other options mentioned, such as the radio conferencer panel, supervisory configuration terminal, and radio subsystem configuration panel, do not specifically mention the role of interfacing between the demarcation panel and radio processor cards. Therefore, the correct answer is the radio distribution panel.

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• 19.

### How many telephone lines are provided by each telephone processor in the enhanced terminal voice switch?

• A.

Four.

• B.

Three.

• C.

Two.

• D.

One.

D. One.
Explanation
Each telephone processor in the enhanced terminal voice switch provides only one telephone line.

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• 20.

### In the enhanced terminal voice switch during radio communications, in what form does microphone audio travel from the operator position to the central equipment?

• A.

Encrypted.

• B.

Digital.

• C.

Analog.

• D.

Cipher.

B. Digital.
Explanation
The microphone audio travels from the operator position to the central equipment in digital form. This means that the audio signals are converted into a series of binary digits (0s and 1s) before being transmitted. This allows for more efficient and reliable transmission, as digital signals are less susceptible to interference and can be easily processed and manipulated by the central equipment. Encryption, cipher, and analog forms are not mentioned in the question and therefore are not relevant to the answer.

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• 21.

### In the digital voice recording system (DVRS), what controls the operation of the digital recording unit?

• A.

Touch entry display.

• B.

Supervisor configuration terminal.

• C.

DVRS workstation.

• D.

Gateway interface cards.

C. DVRS workstation.
Explanation
The DVRS workstation controls the operation of the digital recording unit in the digital voice recording system. It is responsible for managing the recording process, storing the recorded data, and providing access to the recordings. The workstation acts as the central control unit for the DVRS, allowing users to start, stop, and manage recordings, as well as retrieve and playback recorded data. It is an essential component in ensuring the smooth operation of the digital recording system.

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• 22.

### The uninterruptible power supply for the digital voice recording system is designed to provide power for

• A.

One minute.

• B.

Two minutes.

• C.

Three minutes.

• D.

Five minutes.

D. Five minutes.
Explanation
The uninterruptible power supply for the digital voice recording system is designed to provide power for five minutes. This means that in the event of a power outage, the system will continue to function for a duration of five minutes before it shuts down. This is important for ensuring that any ongoing voice recordings are not lost or interrupted during a power failure. A longer power supply duration would be beneficial in case the power outage lasts longer or if there is a need to safely shut down the system.

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• 23.

### In the digital voice recording system, what is the recording capacity of each digital audiotape?

• A.

100 linear hours.

• B.

500 linear hours.

• C.

750 linear hours.

• D.

1000 linear hours.

B. 500 linear hours.
Explanation
The correct answer is 500 linear hours. This means that each digital audiotape in the digital voice recording system can record up to 500 hours of audio.

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• 24.

### In the digital voice recording system, how many satellites need to be acquired by the global positioning system receiver for an accurate time stamp?

• A.

One.

• B.

Two.

• C.

Three.

• D.

Four.

C. Three.
Explanation
In order to obtain an accurate time stamp in a digital voice recording system, the global positioning system receiver needs to acquire signals from three satellites. This is because the receiver uses the signals from multiple satellites to triangulate its position and calculate the precise time. By acquiring signals from at least three satellites, the receiver can accurately determine the time and synchronize it with the digital voice recording system.

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• 25.

### The alarms on the digital voice recording system alerts users when channels are

• A.

Inactive.

• B.

Shifting.

• C.

Off-key.

• D.

Active.

A. Inactive.
Explanation
The correct answer is "inactive" because the alarms on the digital voice recording system are designed to notify users when channels are not in use or not producing any sound. This is important to ensure that the system is functioning properly and to avoid missing any important recordings.

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• 26.

### When does the digital voice recording system digital recording unit copy hard drive information to a digital audiotape?

• A.

Continuously.

• B.

Every 15 minutes.

• C.

Every 30 minutes.

• D.

Only when prompted by an operator.

B. Every 15 minutes.
Explanation
The digital voice recording system's digital recording unit copies hard drive information to a digital audiotape every 15 minutes. This regular interval ensures that the data on the hard drive is consistently backed up to the audiotape, reducing the risk of data loss in case of any system failure or malfunction. This frequent backup also allows for easy retrieval and access to the recorded information when needed.

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• 27.

### The tactical air navigation system, AN/TRN–26, provides radio navigation information for up to how many aircraft simultaneously?

• A.

100.

• B.

120.

• C.

150.

• D.

170.

A. 100.
Explanation
The AN/TRN-26 tactical air navigation system is capable of providing radio navigation information for up to 100 aircraft simultaneously. This means that the system can handle and provide navigation data to a maximum of 100 aircraft at the same time.

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• 28.

### Upon the detection of parameter faults, the tactical air navigation system, AN/TRN–26, transponder will

• A.

Stop emitting squitter.

• B.

Switch frequencies.

• C.

Ignore all faults.

• D.

Shutdown.

D. Shutdown.
Explanation
Upon the detection of parameter faults, the tactical air navigation system, AN/TRN–26, will shutdown. This means that the system will completely turn off and cease all operations. This is likely done to prevent any further damage or errors caused by the parameter faults. Shutting down the system allows for troubleshooting and repairs to be made before it is restarted.

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• 29.

### Based on technical data, how many people does it take to set up the tactical air navigation system, AN/TRN–26, in less than one hour?

• A.

Two.

• B.

Four.

• C.

Six.

• D.

Eight.

B. Four.
Explanation
Based on technical data, it takes four people to set up the tactical air navigation system, AN/TRN–26, in less than one hour.

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• 30.

### The antenna height of the tactical air navigation system, AN/TRN–26, is adjustable between

• A.

1.5 and 8.5 feet above ground level.

• B.

3.5 and 8.5 feet above ground level.

• C.

6.5 and 10 feet above ground level.

• D.

7.5 and 10 feet above ground level.

D. 7.5 and 10 feet above ground level.
Explanation
The correct answer is 7.5 and 10 feet above ground level. This is because the question states that the antenna height of the tactical air navigation system, AN/TRN-26, is adjustable between certain ranges. Among the given options, only the range of 7.5 and 10 feet above ground level falls within the specified adjustable range.

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• 31.

### The tactical air navigation system, AN/TRN–26, antenna support consists of how many major components?

• A.

Five.

• B.

Four.

• C.

Three.

• D.

Two.

C. Three.
Explanation
The correct answer is three because the question asks for the number of major components in the antenna support of the tactical air navigation system, AN/TRN-26. The word "major" indicates that there are key components that make up the support system, and the answer options suggest different quantities. Therefore, the correct answer is three, implying that there are three significant components in the antenna support.

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• 32.

### The tactical air navigation system, AN/TRN–26, has time-coded pulses transmitted on any one of the

• A.

126 channels spaced 1-MHz apart.

• B.

128 channels spaced 1-MHz apart.

• C.

126 channels spaced 2-MHz apart.

• D.

128 channels spaced 2 MHz apart.

A. 126 channels spaced 1-MHz apart.
Explanation
The tactical air navigation system, AN/TRN-26, has time-coded pulses transmitted on any one of the 126 channels spaced 1-MHz apart. This means that the system can transmit pulses on a total of 126 different channels, and each channel is spaced 1-MHz apart from the adjacent channel. This spacing allows for precise and accurate navigation as the system can transmit and receive signals on different frequencies, ensuring minimal interference and maximum coverage.

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• 33.

### Which parameter is continuously monitored by the tactical air navigation system, AN/TRN– 26’s, radio frequency monitor?

• A.

Peak power.

• B.

Sideband amplitude.

• C.

Modulation percentage.

• D.

Antenna rotation speed.

A. Peak power.
Explanation
The tactical air navigation system, AN/TRN-26, continuously monitors the peak power through its radio frequency monitor. This parameter is important as it helps determine the maximum power level of the signal being transmitted. By monitoring the peak power, the system can ensure that the transmitted signal is within the desired range and avoid any potential issues or interference. Therefore, peak power is the parameter that is continuously monitored by the AN/TRN-26's radio frequency monitor.

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• 34.

### Under normal operating conditions at remote locations, what powers the tactical air navigation system, AN/TRN–26?

• A.

Direct current generator set.

• B.

120 volt alternation current generator.

• C.

• D.

Silver-zinc rechargeable battery.

A. Direct current generator set.
Explanation
The tactical air navigation system, AN/TRN-26, is powered by a direct current generator set. This type of generator produces a continuous flow of electrical current in one direction, which is essential for powering the system in remote locations. Alternating current generators, on the other hand, produce a current that constantly changes direction and would not be suitable for powering the system. Nickel-cadmium and silver-zinc rechargeable batteries are not mentioned as power sources for the AN/TRN-26, making the direct current generator set the correct answer.

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• 35.

### The tactical air navigation system, AN/TRN–26, requires what operating voltage?

• A.

12 VDC.

• B.

24 VDC.

• C.

28 VDC.

• D.

32 VDC.

C. 28 VDC.
Explanation
The correct answer is 28 VDC. The tactical air navigation system, AN/TRN-26, operates on a voltage of 28 VDC.

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• 36.

### How many test interrogations per second do the radio frequency monitors route into the tactical air navigation system, AN/TRN–26?

• A.

7200.

• B.

900.

• C.

100.

• D.

25.

D. 25.
Explanation
The correct answer is 25. This suggests that the radio frequency monitors route 25 test interrogations per second into the tactical air navigation system, AN/TRN-26.

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• 37.

### What does the tactical air navigation system, AN/TRN–26, receiver-transmitter do to hold the average output power level constant?

• A.

• B.

Increases antenna rotation rate.

• C.

• D.

Inserts random squitter transmissions.

D. Inserts random squitter transmissions.
Explanation
The tactical air navigation system, AN/TRN-26, receiver-transmitter holds the average output power level constant by inserting random squitter transmissions. Squitter transmissions are unmodulated pulses that are randomly inserted into the system's output. These random squitter transmissions help maintain a constant average power level by compensating for any fluctuations or variations in the system's output power.

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• 38.

### What determines the rotational speed of the tactical air navigation system, AN/TRN–26, antenna drive motor?

• A.

Applied current.

• B.

Applied voltage.

• C.

Phase of applied voltage.

• D.

Frequency of applied voltage.

D. Frequency of applied voltage.
Explanation
The rotational speed of the tactical air navigation system's antenna drive motor is determined by the frequency of the applied voltage. The frequency of the voltage signal directly affects the speed at which the motor rotates. Higher frequencies result in faster rotation, while lower frequencies result in slower rotation. Therefore, the frequency of the applied voltage is the determining factor for the rotational speed of the motor.

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• 39.

### How many parasitic director elements are mounted on the drum of the tactical air navigation system, AN/TRN–26, antenna?

• A.

7

• B.

8

• C.

9

• D.

10

C. 9
Explanation
The correct answer is 9. This means that there are 9 parasitic director elements mounted on the drum of the tactical air navigation system, AN/TRN–26, antenna.

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• 40.

### The power supply in the tactical air navigation system, AN/TRN–26, converts the primary power to secondary regulated voltages of

• A.

+200, +25.2, +12.6, and –12.6 volts direct current (DC).

• B.

+200, +25.2, +12.6, and –12.6 volts alternating current (AC).

• C.

+25.2, +12.6, and –12.6 volts DC.

• D.

+25.2, +12.6, and –12.6 volts AC.

A. +200, +25.2, +12.6, and –12.6 volts direct current (DC).
Explanation
The power supply in the tactical air navigation system, AN/TRN–26, converts the primary power to secondary regulated voltages of +200, +25.2, +12.6, and –12.6 volts direct current (DC). This means that the power supply takes the incoming primary power and transforms it into these specific voltages in the form of direct current (DC). The system requires these specific voltages to operate properly, and the power supply ensures that the correct voltages are provided.

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• 41.

### A lightweight, portable, tactical air navigation system designed to provide a combat control team with a navigational aid is the

• A.

AN/GMQ–33.

• B.

AN/TMQ–36.

• C.

AN/TRN–26.

• D.

AN/TRN–41.

D. AN/TRN–41.
Explanation
The AN/TRN-41 is the correct answer because it is a lightweight, portable, tactical air navigation system specifically designed to provide a combat control team with a navigational aid. The other options do not match this description.

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• 42.

### The tactical air navigation system, AN/TRN–41, can provide azimuth, distance, and identification information for how many aircraft simultaneously?

• A.

100.

• B.

120.

• C.

150.

• D.

170.

A. 100.
Explanation
The tactical air navigation system, AN/TRN-41, is capable of providing azimuth, distance, and identification information for up to 100 aircraft simultaneously.

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• 43.

### The primary power source for the tactical air navigation system, AN/TRN–41, is

• A.

• B.

A silver-zinc rechargeable battery.

• C.

Any 115/220 volts, alternating current source.

• D.

A diesel powered generator.

B. A silver-zinc rechargeable battery.
Explanation
The primary power source for the tactical air navigation system, AN/TRN–41, is a silver-zinc rechargeable battery. This type of battery is commonly used in military applications due to its high energy density, long life, and ability to withstand harsh conditions. It provides a reliable and portable power source for the system, allowing it to operate effectively in various tactical situations.

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• 44.

### The tactical air navigation system, AN/TRN–41 as a system, can operate on what tactical air navigation (TACAN) channels?

• A.

All “Y” channels.

• B.

All “X” channels.

• C.

All TACAN channels.

• D.

“X” high band channels only.

C. All TACAN channels.
Explanation
The correct answer is "All TACAN channels." This means that the tactical air navigation system, AN/TRN-41, can operate on any channel within the TACAN system. It is not limited to specific channels such as only "Y" or "X" channels, or only "X" high band channels. The system is capable of functioning on all available TACAN channels.

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• 45.

### The tactical air navigation system, AN/TRN–41 antenna is an all band, direct drive, mechanically rotated antenna that operates over the whole range of the TACAN frequencies from

• A.

962–1213MHz.

• B.

962–1413MHz.

• C.

1062–1213 MHz.

• D.

1062–1413 MHz.

A. 962–1213MHz.
Explanation
The correct answer is 962–1213MHz. This is because the tactical air navigation system, AN/TRN–41 antenna operates over the whole range of TACAN frequencies from 962–1213MHz.

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• 46.

### The tactical air navigation system, AN/TRN–41 antenna support assembly allows the antenna to be set up on a slope of up to

• A.

4 degrees.

• B.

7.5 degrees.

• C.

10 degrees.

• D.

15 degrees.

C. 10 degrees.
Explanation
The correct answer is 10 degrees. The tactical air navigation system, AN/TRN-41 antenna support assembly allows the antenna to be set up on a slope of up to 10 degrees.

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• 47.

### The external power amplifier in the tactical air navigation system, AN/TRN–41 provides how much gain to double the output of the receiver-transmitter twice?

• A.

One dB.

• B.

Three dB.

• C.

Six dB.

• D.

Nine dB.

C. Six dB.
Explanation
The external power amplifier in the tactical air navigation system, AN/TRN-41 provides a gain of six dB to double the output of the receiver-transmitter twice. Gain is a measure of amplification, and a gain of six dB means that the output signal will be amplified by a factor of four (2^2). Therefore, to double the output twice, a gain of six dB is required.

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• 48.

### The power output of the tactical air navigation system, AN/TRN–41 is greater than

• A.

100 watts peak.

• B.

200 watts peak.

• C.

300 watts peak.

• D.

1000 watts peak.

A. 100 watts peak.
Explanation
The power output of the tactical air navigation system, AN/TRN-41, is stated to be greater than 100 watts peak. This means that the system is capable of producing power output that exceeds 100 watts at its peak performance. However, the exact power output is not specified beyond this threshold.

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• 49.

### How long does it take the tactical air navigation system, AN/TRN–41, antenna to come up to its operating speed?

• A.

5 seconds.

• B.

10 seconds.

• C.

30 seconds.

• D.

60 seconds.

B. 10 seconds.
Explanation
The tactical air navigation system, AN/TRN-41, antenna takes 10 seconds to come up to its operating speed.

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• 50.

### The tactical air navigation system, AN/TRN–41, the battery can supply power for full system operation for

• A.

72 hours.

• B.

24 hours.

• C.

12 hours.

• D.

4 hours.

D. 4 hours.
Explanation
The given correct answer is 4 hours. This implies that the battery of the tactical air navigation system, AN/TRN–41, is capable of providing power for the full system operation for only 4 hours. This indicates that the battery has a limited capacity and would need to be recharged or replaced after 4 hours of continuous use.

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