3d1x5 Volume 2 (Ure)
Volume 2 for 3D1X5 CDCs
- 1.
The airport surveillance radar (ASR) is used in which air traffic control (ATC) radar mission?
- A.
Local control
- B.
Terminal control area
- C.
Air route traffic control
- D.
Precision approach radar control
Correct Answer
B. Terminal control area -
- 2.
Azimuth resolution is directly related to what radar set characteristic?
- A.
Pulse recurrence frequency
- B.
Transmitted pulse width
- C.
Pulse recurrence time
- D.
Antenna beam width
Correct Answer
D. Antenna beam width -
- 3.
The airport surveillance radar transmitter site should be located more than ½ mile from the primary instrument approach path and touch-down point so that these areas
- A.
Fall within receiver recovery time
- B.
Fall within processor recovery time
- C.
Do not fall within receiver recovery time
- D.
Do not fall within processor recovery time
Correct Answer
C. Do not fall within receiver recovery time -
- 4.
The point designated as touchdown for a precision approach radar (PAR) is normally how many feet from the end of the runway?
- A.
500 exclusive of any overruns
- B.
500 inclusive of any overruns
- C.
1,000 exclusive of any overruns
- D.
1,000 inclusive of any overruns
Correct Answer
C. 1,000 exclusive of any overruns -
- 5.
Siting a precision approach radar (PAR) for multiple runway approaches can cause you to locate the unit outside the optimum coverage areas. If this occurs what would be the best location for the radar system?
- A.
No location is best; do not install the PAR
- B.
At the center point between runway overruns
- C.
A position where it gives limited coverage to all of your runways
- D.
A position where it gives the best coverage to your most important runway
Correct Answer
D. A position where it gives the best coverage to your most important runway -
- 6.
In the AN/GPN–22 precision approach radar (PAR) system, frequency diversity is used in the scan mode to eliminate
- A.
Weather returns
- B.
Large target fluctuations only
- C.
Large target fluctuations and weather returns
- D.
Large target fluctuations and provide target enhancement
Correct Answer
D. Large target fluctuations and provide target enhancement -
- 7.
In the AN/GPN–22 precision approach radar (PAR) system, frequency diversity is accomplished by transmitting two 1 microsecond (μsec) pulses that are composed of two X-band frequencies separated by
- A.
24 MHz
- B.
37 MHz
- C.
74 MHz
- D.
124 MHz
Correct Answer
B. 37 MHz -
- 8.
In the AN/GPN–22 precision approach radar (PAR), the coherent and non-coherent input to the moving target indictor (MTI) detector is outputted as
- A.
Unipolar video
- B.
Bipolar video
- C.
Canceled unipolar video
- D.
Canceled bipolar video
Correct Answer
B. Bipolar video -
- 9.
Once a track is established in the AN/GPN–22 precision approach radar (PAR), what device uses error data obtained from the received signal to predict where the target will be during the next track interval?
- A.
Target Data Computer (TDC)
- B.
Signal Data Converter (SDC)
- C.
Computer Data Entry Module (CDEM)
- D.
Antenna Beam Position Control Unit (ABPCU)
Correct Answer
A. Target Data Computer (TDC) -
- 10.
How many narrow band filters does the AN/GPN–22 precision approach radar (PAR) employ to convert a shift in intermediate frequency (IF) to a range error signal?
- A.
24
- B.
37
- C.
74
- D.
137
Correct Answer
A. 24 -
- 11.
In the AN/GPN–22 precision approach radar (PAR), the operational program is locked to the real-time radar operations by the interrupt command signal from the
- A.
Dual channel receiver processor
- B.
Antenna beam position unit
- C.
Radar data transfer group
- D.
Refresh memory
Correct Answer
A. Dual channel receiver processor -
- 12.
At what interval does the AN/GPN–22 precision approach radar’s (PAR) target data computer (TDC) perform system fault monitoring?
- A.
Every pulse recurrence time (PRT)
- B.
Once every 2 seconds
- C.
Once per track interval
- D.
At beam interrupt signal time
Correct Answer
B. Once every 2 seconds -
- 13.
In the AN/GPN–22 precision approach radar (PAR), what are the three modes of operation with respect to data loop operation?
- A.
Command, open-loop, closed-loop
- B.
Diagnostic, operational, coherent
- C.
Data point, closed-loop, self-test
- D.
Command, input, and output
Correct Answer
D. Command, input, and output -
- 14.
In the AN/GPN–22 precision approach radar (PAR), the data loop interface logic circuitry used in each of the subsystems is commonly called
- A.
One’s complement
- B.
Repeater logic
- C.
Closed-loop
- D.
Open-loop
Correct Answer
B. Repeater logic -
- 15.
The target data computer in the AN/GPN–22 precision approach radar (PAR) processes the site parameter panel data once
- A.
Every track interval
- B.
Per scan interval
- C.
Every 2 seconds
- D.
Per second
Correct Answer
C. Every 2 seconds -
- 16.
The AN/GPN–22 precision approach radar (PAR) required input voltage is 3-phase,
- A.
110 volt, alternating current (VAC)
- B.
110 volt, direct current (VDC)
- C.
208 VAC
- D.
208 VDC
Correct Answer
C. 208 VAC -
- 17.
AN/GPN–22 precision approach radar (PAR) emergency power is supplied by a
- A.
12-volt, alternating current (VAC) battery
- B.
12-volt, direct current (VDC) battery
- C.
110-VDC battery
- D.
208-VDC battery
Correct Answer
B. 12-volt, direct current (VDC) battery -
- 18.
On the AN/GPN–22 precision approach radar (PAR) radar set controls (RSC), an “OVER TEMP” fault lamp indicates
- A.
Insufficient cooling
- B.
Excessive current draw
- C.
Excessive voltage production
- D.
Excessive current draw or insufficient cooling
Correct Answer
D. Excessive current draw or insufficient cooling -
- 19.
What capability makes the traveling wave tube (TWT) much more versatile than the magnetron?
- A.
It is a remarkably stable oscillator
- B.
It is a wide band amplifier and not an oscillator
- C.
It is far more efficient at using repeller plate potential
- D.
Its narrow bandwidth provides unsurpassed frequency stability
Correct Answer
B. It is a wide band amplifier and not an oscillator -
- 20.
What is the original source of the continuous wave (CW) radio frequency (RF) drive in the AN/GPN–22 precision approach radar (PAR)?
- A.
37-megahertz (MHz) crystal oscillator
- B.
74-MHz crystal oscillator
- C.
Stable local oscillator
- D.
Local oscillator
Correct Answer
A. 37-megahertz (MHz) crystal oscillator -
- 21.
In the AN/GPN–22 precision approach radar (PAR), the stabilized master oscillator (STAMO) multiplies the continuous wave (CW) transmitter drive signal to the
- A.
L-band
- B.
S-band
- C.
W-band
- D.
X-band
Correct Answer
D. X-band -
- 22.
The purpose of the traveling wave tube (TWT) radar modulator A6 in the AN/GPN–22 precision approach radar (PAR) transmitter is to
- A.
Provide voltage amplification and trigger shaping to the TWT modulator trigger
- B.
Produce excitation voltage for the cathode of the TWT modulator trigger
- C.
Modulate the incoming video for conversion to intermediate frequency (IF)
- D.
Provide pulse shaping for stable master oscillator
Correct Answer
A. Provide voltage amplification and trigger shaping to the TWT modulator trigger -
- 23.
In the scan mode, the AN/GPN–22 precision approach radar (PAR) can direct the radio frequency (RF) beam to how many separate beam positions?
- A.
443
- B.
439
- C.
423
- D.
421
Correct Answer
B. 439 -
- 24.
Which of the following is an off-line test performed on the antenna position control unit (APCU) in the AN/GPN–22 precision approach radar (PAR)?
- A.
Mode control
- B.
Open loop
- C.
Closed loop
- D.
Rebound
Correct Answer
D. Rebound -
- 25.
The AN/GPN–22 precision approach radar’s (PAR) transmit/receive (T/R) section
- A.
Filters out unwanted frequencies
- B.
Provides amplification of the transmitted pulse
- C.
Produces the second intermediate frequency
- D.
Prevents receiver damage by the transmitter high-power pulse
Correct Answer
D. Prevents receiver damage by the transmitter high-power pulse -
- 26.
As the range increases, the sensitivity time control (STC) attenuation in the AN/GPN–22 precision approach radar (PAR) is stepped down in what increments?
- A.
3 dB
- B.
6 dB
- C.
10 dB
- D.
12 dB
Correct Answer
C. 10 dB -
- 27.
What is the total number of automatic alignment procedures to be performed by the timing generator during dead time in the AN/GPN–22 precision approach radar (PAR)?
- A.
Two
- B.
Four
- C.
Six
- D.
Eight
Correct Answer
D. Eight -
- 28.
Which AN/GPN–22 precision approach radar (PAR) dual-redundant receiver module performs the filtering, limiting, phase detection, analog-to-digital (A/D) conversion, decommutation, and integration of the azimuth and elevation signals?
- A.
IF down converter
- B.
Error detector
- C.
Frequency converter
- D.
MTI detector
Correct Answer
B. Error detector -
- 29.
In the AN/GPN–22 precision approach radar (PAR), the non-coherent mode of operation is used to
- A.
Cancel slow moving targets
- B.
Cancel the presence of rain only
- C.
Detect the outline of weather only
- D.
Detect a target in the presence of moving clutter such as rain
Correct Answer
D. Detect a target in the presence of moving clutter such as rain -
- 30.
All of the front panel switches in the special test section of the dual redundant receiver of the AN/GPN–22 precision approach radar (PAR) are disabled during normal operation except for the
- A.
LN/LM switch
- B.
Beam width switch
- C.
Preamplifier switch
- D.
Transmitter frequency switch
Correct Answer
A. LN/LM switch -
- 31.
In the dual redundant receiver of the AN/GPN–22 precision approach radar (PAR), which of the following best describes the fault hierarchy for the automatic fault testing?
- A.
The last module on the chain is tested first
- B.
The testing is randomly selected by the TDC
- C.
Modules are prewired to a fixed testing sequence
- D.
Modules that affect the testing of others are tested first
Correct Answer
D. Modules that affect the testing of others are tested first -
- 32.
In the AN/GPN–22 precision approach radar’s (PAR) signal data converter (SDC), what permits the comparison of echoes from three radar receive periods?
- A.
Phase comparison
- B.
Phase comparison and video shifting
- C.
Conversion of bipolar video to a digital form
- D.
Conversion of unipolar video to a digital form
Correct Answer
C. Conversion of bipolar video to a digital form -
- 33.
In the AN/GPN–22 precision approach radar (PAR), what is the output of the signal data converter (SDC) to the indicator group?
- A.
Bipolar video
- B.
Unipolar video
- C.
Enhanced digital video
- D.
Enhanced negative video
Correct Answer
B. Unipolar video -
- 34.
In single cancellation, what happens to the pulse train after it is time-aligned with the next range scan?
- A.
The second range scan is added to the first
- B.
The signal bit is removed from the digital word
- C.
The second range scan is subtracted from the first
- D.
The magnitude information is extracted from the pulse train
Correct Answer
C. The second range scan is subtracted from the first -
- 35.
How many radar scans does double cancellation require?
- A.
Two
- B.
Three
- C.
Four
- D.
Five
Correct Answer
B. Three -
- 36.
In the AN/GPN–22 precision approach radar (PAR), how many scan periods are required to perform video integration in the signal data converter (SDC)?
- A.
Three
- B.
Four
- C.
Five
- D.
Six
Correct Answer
A. Three -
- 37.
What identifies and blanks returns from targets beyond the operating range of the radar?
- A.
Phase detector
- B.
Coherent canceller
- C.
Analog to digital converter
- D.
Second-time-around reduction circuits
Correct Answer
D. Second-time-around reduction circuits -
- 38.
What type of multiplexing is used in the closure, analog, digital, and video/trigger/data channels of the AN/GPN–22 precision approach radar (PAR)?
- A.
Time division
- B.
Frequency
- C.
Amplitude
- D.
Phase
Correct Answer
A. Time division -
- 39.
Which multiplexing process is used when we combine five different channels into one common channel?
- A.
Frequency-division
- B.
Time-division
- C.
Amplitude
- D.
Phase
Correct Answer
A. Frequency-division -
- 40.
The most common method of modulation used in remoting is
- A.
Amplitude modulation (AM)
- B.
Frequency shift keying (FSK)
- C.
Pulse code modulation (PCM)
- D.
Sideband
Correct Answer
A. Amplitude modulation (AM) -
- 41.
In the AN/GPN–22 precision approach radar (PAR) remoting system, what two types of modulation does the analog data undergo?
- A.
Amplitude modulation (AM) and phase
- B.
Pulse code modulation (PCM) and AM
- C.
AM and frequency key shifting (FSK)
- D.
PCM and FSK
Correct Answer
B. Pulse code modulation (PCM) and AM -
- 42.
Which converter is used in both the AN/GPN–22 precision approach radar (PAR) shelter and radar approach control (RAPCON) remoting equipment to convert the parallel 32-bit data words to serial data and back again?
- A.
Digital-to-digital (D/D)
- B.
Analog-to-digital (A/D)
- C.
Digital-to-analog (D/A)
- D.
Analog-to-analog (A/A)
Correct Answer
A. Digital-to-digital (D/D) -
- 43.
In the AN/GPN–22 precision approach radar (PAR) remoting system, which channel is not remoted to the radar unit?
- A.
Voice
- B.
Digital
- C.
Analog
- D.
Video/triggers/data
Correct Answer
D. Video/triggers/data -
- 44.
What AN/GPN–22 precision approach radar (PAR) remoting channel is multiplexed but does not modulate a subcarrier, since the frequency range of the information makes it suitable for direct transmission?
- A.
Voice
- B.
Digital
- C.
Analog
- D.
Video/triggers/data
Correct Answer
D. Video/triggers/data -
- 45.
Where are the modulated subcarriers that represent the various types of inputs to the AN/GPN–22 precision approach radar (PAR) remoting circuits summed?
- A.
Combiner circuits
- B.
Target data computer
- C.
Remoting common channel
- D.
Video/trigger channel separator
Correct Answer
C. Remoting common channel -
- 46.
In the remoting section of the AN/GPN–22 precision approach radar (PAR), what is the purpose of the line driver equalizer circuits?
- A.
Fixes the input level flatness
- B.
Compensates for amplitude losses
- C.
Provides the required current output
- D.
Frequency compensates the response for cable length
Correct Answer
D. Frequency compensates the response for cable length -
- 47.
In remoting signals, line attenuation is greatest at the
- A.
Higher frequencies
- B.
Intermediate and higher frequencies
- C.
Lower frequencies
- D.
Intermediate and lower frequencies
Correct Answer
A. Higher frequencies -
- 48.
The precision approach radar (PAR) indicator system indicates an aircraft’s
- A.
Elevation only
- B.
Range and azimuth
- C.
Elevation and range
- D.
Elevation, range, and azimuth
Correct Answer
D. Elevation, range, and azimuth -
- 49.
The precision approach radar (PAR) indicator system displays the decision height cursor
- A.
In azimuth only
- B.
In azimuth and elevation
- C.
Along the elevation glidepath
- D.
Only when selected in azimuth
Correct Answer
C. Along the elevation glidepath -
- 50.
The precision approach radar (PAR) indicator system displays the reference reflector
- A.
In azimuth only
- B.
In azimuth and elevation
- C.
Along the elevation glidepath
- D.
Only when selected
Correct Answer
A. In azimuth only -
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Current Version
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Mar 21, 2022Quiz Edited by
ProProfs Editorial Team -
Jul 03, 2012Quiz Created by
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