FCC GROL Element 8 Exam Questions and Answers Latest Update 2025-2026
8-1A2 Which of the following has NO effect on the maximum range capability?
A. Carrier frequency
B. Recovery time
C. Pulse repetition frequency
D. Receiver sensitivity - Answers B. Recovery time
8-1A4 What RADAR component controls timing throughout the system?
A. Power supply
B. Indicator
C. Synchronizer
D. Receiver - Answers C. Synchronizer
8-2A1 A radio wave will travel a distance of three nautical miles in:
A. 6.17 microseconds
B. 37.0 microseconds
C. 22.76 microseconds
D. 18.51 microseconds - Answers D. 18.51 microseconds
8-2A3 An S-band RADAR operates in which frequency band?
A. 1-2 GHz
B. 4-8 GHz
C. 8-12 GHz
D. 2-4 GHz - Answers D. 2-4 GHz
8-3A5 The major advantage of an S-band RADAR over an X-band RADAR is:
A. It is less affected by weather conditions.
B. It has greater bearing resolution.
C. It is mechanically less complex.
,D. It has greater power output. - Answers A. It is less affected by weather conditions.
8-3A6 An X-band RADAR operates in which frequency band?
A. 1-2 GHz
B. 2-4 GHz
C. 4-8 GHz
D. 8-12 GHz - Answers D. 8-12 GHz
8-4A4 If a RADAR transmitter has a pulse repetition frequency (PRF) of 900 Hz, a pulse width of
0.5 microseconds and a peak power of 15 kilowatts, what is its average power output?
A. 15 kilowatts.
B. 13.5 watts.
C. 6.75 watts.
D. 166.67 watts. - Answers C. 6.75 watts.
8-4A5 What is the average power if the RADAR set has a (PRF) of 1000 Hz, a pulse width of 1
microsecond, and a peak power rating of 100 kilowatts?
A. 10 watts.
B. 100 watts.
C. 1000 watts.
D. None of these. - Answers B. 100 watts.
8-5A1 For a range of 5 nautical miles, the RADAR pulse repetition frequency should be:
A. 16.2 Hz or more.
B. 16.2 MHz or less.
C. 1.62 kHz or more.
D. 16.2 kHz or less - Answers D. 16.2 kHz or less
8-5A2 For a range of 100 nautical miles, the RADAR pulse repetition frequency should be:
A. 8.1 kHZ or less.
B. 810 Hz or less.
, C. 8.1 kHz or more.
D. 81 kHz or more. - Answers B. 810 Hz or less.
8-5A6 For a range of 10 nautical miles, the RADAR pulse repetition frequency (PRF) should be:
A. Approximately 8.1 kHz or less.
B. 900 Hz.
C. 18.1 kHz or more.
D. 120.3 microseconds. - Answers A. Approximately 8.1 kHz or less.
8-6A2 If the pulse repetition frequency (PRF) is 2000 HZ, what is the pulse repetition interval
(PRI)?
A. 0.05 seconds.
B. 0.005 seconds.
C. 0.0005 seconds.
D. 0.00005 seconds. - Answers C. 0.0005 seconds.
8-6A5 Small targets are best detected by:
A. Short pulses transmitted at a fast rate.
B. Using J-band frequencies.
C. Using a long pulse width with high output power.
D. All of these answers are correct. - Answers C. Using a long pulse width with high output
power.
8-7A3 When comparing a TTL and a CMOS NAND gate:
A. Both have active pull-up characteristics.
B. Both have three output states.
C. Both have comparable input power sourcing.
D. Both employ Schmitt diodes for increased speed capabilities. - Answers A. Both have active
pull-up characteristics.
8-7A6 What component of a RADAR reciever is represented by block 47 in Fig. 8A1?
A. The ATR box.
8-1A2 Which of the following has NO effect on the maximum range capability?
A. Carrier frequency
B. Recovery time
C. Pulse repetition frequency
D. Receiver sensitivity - Answers B. Recovery time
8-1A4 What RADAR component controls timing throughout the system?
A. Power supply
B. Indicator
C. Synchronizer
D. Receiver - Answers C. Synchronizer
8-2A1 A radio wave will travel a distance of three nautical miles in:
A. 6.17 microseconds
B. 37.0 microseconds
C. 22.76 microseconds
D. 18.51 microseconds - Answers D. 18.51 microseconds
8-2A3 An S-band RADAR operates in which frequency band?
A. 1-2 GHz
B. 4-8 GHz
C. 8-12 GHz
D. 2-4 GHz - Answers D. 2-4 GHz
8-3A5 The major advantage of an S-band RADAR over an X-band RADAR is:
A. It is less affected by weather conditions.
B. It has greater bearing resolution.
C. It is mechanically less complex.
,D. It has greater power output. - Answers A. It is less affected by weather conditions.
8-3A6 An X-band RADAR operates in which frequency band?
A. 1-2 GHz
B. 2-4 GHz
C. 4-8 GHz
D. 8-12 GHz - Answers D. 8-12 GHz
8-4A4 If a RADAR transmitter has a pulse repetition frequency (PRF) of 900 Hz, a pulse width of
0.5 microseconds and a peak power of 15 kilowatts, what is its average power output?
A. 15 kilowatts.
B. 13.5 watts.
C. 6.75 watts.
D. 166.67 watts. - Answers C. 6.75 watts.
8-4A5 What is the average power if the RADAR set has a (PRF) of 1000 Hz, a pulse width of 1
microsecond, and a peak power rating of 100 kilowatts?
A. 10 watts.
B. 100 watts.
C. 1000 watts.
D. None of these. - Answers B. 100 watts.
8-5A1 For a range of 5 nautical miles, the RADAR pulse repetition frequency should be:
A. 16.2 Hz or more.
B. 16.2 MHz or less.
C. 1.62 kHz or more.
D. 16.2 kHz or less - Answers D. 16.2 kHz or less
8-5A2 For a range of 100 nautical miles, the RADAR pulse repetition frequency should be:
A. 8.1 kHZ or less.
B. 810 Hz or less.
, C. 8.1 kHz or more.
D. 81 kHz or more. - Answers B. 810 Hz or less.
8-5A6 For a range of 10 nautical miles, the RADAR pulse repetition frequency (PRF) should be:
A. Approximately 8.1 kHz or less.
B. 900 Hz.
C. 18.1 kHz or more.
D. 120.3 microseconds. - Answers A. Approximately 8.1 kHz or less.
8-6A2 If the pulse repetition frequency (PRF) is 2000 HZ, what is the pulse repetition interval
(PRI)?
A. 0.05 seconds.
B. 0.005 seconds.
C. 0.0005 seconds.
D. 0.00005 seconds. - Answers C. 0.0005 seconds.
8-6A5 Small targets are best detected by:
A. Short pulses transmitted at a fast rate.
B. Using J-band frequencies.
C. Using a long pulse width with high output power.
D. All of these answers are correct. - Answers C. Using a long pulse width with high output
power.
8-7A3 When comparing a TTL and a CMOS NAND gate:
A. Both have active pull-up characteristics.
B. Both have three output states.
C. Both have comparable input power sourcing.
D. Both employ Schmitt diodes for increased speed capabilities. - Answers A. Both have active
pull-up characteristics.
8-7A6 What component of a RADAR reciever is represented by block 47 in Fig. 8A1?
A. The ATR box.
