Vayudoot Aviation

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

617 pps

810 pss

1234 pps

1620 pulses per second (pps)

2. 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?

258 km

278 km

516 km

139 km

3. The main advantage of continuous wave radars is

Better range resolution

No minimum range limitation

No maximum range limitation

Better range resolution

4. The bearing of a primary radar is measured by

lobe comparison

phase comparison

searchlight principle

DF techniques

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

8

2

16

4

6. To improve the resolution of a radar display requires

a narrow pulse width and a narrow beam width

a wide beamwidth and a wide pulse width

a high frequency and a large reflector

a low frequency and a narrow pulse width

7. The factor which determines the maximum range of a radar is

power

pulse width

pulse repetition rate

beamwidth

8. 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

9. The factor which limits the minimum detection range of a radar is

pulse width

pulse repetition interval

transmitter power

pulse repetition frequency

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

270 nm

135 nm

73 nm

146 nm

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

6700 pps

25000 pps

13400 pps

12500 pps

12. An advantage of a phased array (slotted antenna. is

all of the above

better resolution

reduced sidelobes and clutter

less power required

13. 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

14. If the PRI of a radar is 2100 microseconds, the maximum range of the radar is

340 nm

630 nm

170 nm

315 nm

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