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1

8-1A1 Choose the most correct statement containing the parameters which control the size of the target echo.
A. Transmitted power, antenna effective area, transmit and receive losses, RADAR cross section of the target, range to target.
B. Height of antenna, power radiated, size of target, receiver gain, pulse width.
C. Power radiated, antenna gain, size of target, shape of target, pulse width, receiver gain.
D. Magnetron gain, antenna gain, size of target, range to target, wave-guide loss.

A. Transmitted power, antenna effective area, transmit and receive losses, RADAR cross section of the target, range to target.

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2

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.

B. Recovery time.

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3

8-1A3 What type of transmitter power is measured over a period of time?
A. Average.
B. Peak.
C. Reciprocal.
D. Return.

A. Average.

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4

8-1A4 What RADAR component controls timing throughout the system?
A. Power supply.
B. Indicator.
C. Synchronizer.
D. Receiver.

C. Synchronizer.

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5

8-1A5 Which of the following components allows the use of a single antenna for both transmitting and receiving?
A. Mixer.
B. Duplexer.
C. Synchronizer.
D. Modulator.

B. Duplexer.

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6

8-1A6 The sweep frequency of a RADAR indicator is determined by what parameter?
A. Carrier frequency.
B. Pulse width.
C. Duty cycle.
D. Pulse repetition frequency.

D. Pulse repetition frequency.

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7

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.

D. 18.51 microseconds.

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8

8-2A2 One RADAR mile is how many microseconds?
A. 6.2
B. 528.0
C. 12.34
D. 0.186

C. 12.34

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9

8-2A3 RADAR range is measured by the constant:
A. 150 meters per microsecond.
B. 150 yards per microsecond.
C. 300 yards per microsecond.
D. 18.6 miles per microsecond.

A. 150 meters per microsecond.

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10

8-2A4 If a target is 5 miles away, how long does it take for the RADAR echo to be received back at the antenna?
A. 51.4 microseconds.
B. 123 microseconds.
C. 30.75 microseconds.
D. 61.7 microseconds.

D. 61.7 microseconds.

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11

8-2A5 How long would it take for a RADAR pulse to travel to a target 10 nautical miles away and return to the RADAR receiver?
A. 12.34 microseconds.
B. 1.234 microseconds.
C. 123.4 microseconds.
D. 10 microseconds.

C. 123.4 microseconds.

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12

8-2A6 What is the distance in nautical miles to a target if it takes 308.5 microseconds for the RADAR pulse to travel from the RADAR antenna to the target and back.
A. 12.5 nautical miles.
B. 25 nautical miles.
C. 50 nautical miles.
D. 2.5 nautical miles.

B. 25 nautical miles.

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13

8-3A1 Frequencies generally used for marine RADAR are in the ___ part of the radio spectrum.
A. UHF
B. EHF
C. SHF
D. VHF

C. SHF

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14

8-3A2 Practical RADAR operation requires the use of microwave frequencies so that:
A. Stronger target echoes will be produced.
B. Ground clutter interference will be minimized.
C. Interference to other communication systems will be eliminated.
D. Non-directional antennas can be used for both transmitting and receiving.

A. Stronger target echoes will be produced.

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15

8-3A3 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.

D. 2 - 4 GHz.

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16

8-3A4 A RADAR operating at a frequency of 3 GHz has a wavelength of approximately:
A. 1 centimeter.
B. 10 centimeters.
C. 3 centimeters.
D. 30 centimeters.

B. 10 centimeters.

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17

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.

A. It is less affected by weather conditions.

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18

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.

D. 8 - 12 GHz.

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19

8-4A1 A pulse RADAR has a pulse repetition frequency (PRF) of 400 Hz, a pulse width of 1 microsecond, and a peak power of 100 kilowatts. The average power of the RADAR transmitter is:
A. 25 watts.
B. 40 watts.
C. 250 watts.
D. 400 watts.

B. 40 watts.

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20

8-4A2 A shipboard RADAR transmitter has a pulse repetition frequency (PRF) of 1,000 Hz, a pulse width of 0.5 microseconds, peak power of 150 KW, and a minimum range of 75 meters. Its duty cycle is:
A. 0.5
B. 0.05
C. 0.005
D. 0.0005

D. 0.0005

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21

8-4A3 A pulse RADAR transmits a 0.5 microsecond RF pulse with a peak power of 100 kilowatts every 1600 microseconds. This RADAR has:
A. An average power of 31.25 watts.
B. A PRF of 3,200.
C. A maximum range of 480 kilometers.
D. A duty cycle of 3.125 percent.

A. An average power of 31.25 watts.

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22

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.

C. 6.75 watts.

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23

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. 1,000 watts.
D. None of these.

B. 100 watts.

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24

8-4A6 A search RADAR has a pulse width of 1.0 microsecond, a pulse repetition frequency (PRF) of 900 Hz, and an average power of 18 watts. The unit’s peak power is:
A. 200 kilowatts.
B. 180 kilowatts.
C. 20 kilowatts.
D. 2 kilowatts.

C. 20 kilowatts.

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25

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.

D. 16.2 kHz or less.

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26

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.

B. 810 Hz or less.

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27

8-5A3 The minimum range of a RADAR is determined by:
A. The frequency of the RADAR transmitter.
B. The pulse repetition rate.
C. The transmitted pulse width.
D. The pulse repetition frequency.

C. The transmitted pulse width.

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28

8-5A4 Short range RADARs would most likely transmit:
A. Narrow pulses at a fast rate.
B. Narrow pulses at a slow rate.
C. Wide pulses at a fast rate.
D. Wide pulses at a slow rate.

A. Narrow pulses at a fast rate.

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29

8-5A5 For a range of 30 nautical miles, the RADAR pulse repetition frequency should be:
A. 0.27 kHz or less.
B. 2.7 kHz or less.
C. 27 kHz or more.
D. 2.7 Hz or more.

B. 2.7 kHz or less.

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30

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.

A. Approximately 8.1 kHz or less.

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