RADAR – Air – DGCA Question Bank For Politics

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#1. The factor which determines the maximum range of a radar is:

pulse repetition rate

pulse width

power

beamwidth

#2. The main advantage of continuous wave radars is:

No maximum range limitation

Better range resolution

No minimum range limitation

Better range resolution

#3. If the PRF of a primary radar is 500 pulses per second, the maximum range will be:

324 nm

300 nm

162 nm

600 nm

#4. To double the range of a primary radar would require the power to be increased by a factor of:

#5. The time between the transmission of a pulse and the reception of the echo from a target is 1720 microseconds. What is the range of the target?

139 km

258 km

516 km

278 km

#6. A radar is required to have a maximum range of 100 nm. What is the maximum PRF that will achieve this?

1620 pulses per second (pps)

1234 pps

617 pps

810 pss

#7. To improve the resolution of a radar display requires:

a narrow pulse width and a narrow beam width

a high frequency and a large reflector

a wide beamwidth and a wide pulse width

a low frequency and a narrow pulse width

#8. An advantage of a phased array (slotted antenna. is:

better resolution

less power required

reduced sidelobes and clutter

all of the above

#9. An echo is received from a target 900 microseconds after the pulse was transmitted. The range to the target is:

73 nm

270 nm

135 nm

146 nm

#10. The factor which limits the minimum detection range of a radar is:

pulse repetition interval

transmitter power

pulse width

pulse repetition frequency

#11. The use of Doppler techniques to discriminate between aircraft and fixed objects results in second trace returns being generated. These are removed by:

using a different frequency for transmission and reception

jittering the PRF

making regular changes in pulsewidth

limiting the power output of the radar

#12. A radar is designed to have a maximum range of 12 km. The maximum PRF that would permit this is:

25000 pps

6700 pps

12500 pps

13400 pps

#13. The bearing of a primary radar is measured by:

phase comparison

searchlight principle

lobe comparison

DF techniques

Finish

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