Vayudoot Aviation

1. 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

2. The main advantage of continuous wave radars is

Better range resolution

No minimum range limitation

No maximum range limitation

Better range resolution

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

pulse repetition interval

pulse width

pulse repetition frequency

transmitter power

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

300 nm

324 nm

600 nm

162 nm

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

pulse repetition rate

power

pulse width

beamwidth

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

135 nm

146 nm

270 nm

73 nm

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

6700 pps

13400 pps

12500 pps

25000 pps

8. 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)

617 pps

1234 pps

810 pss

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

2

4

8

16

10. The bearing of a primary radar is measured by

searchlight principle

phase comparison

lobe comparison

DF techniques

11. 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 low frequency and a narrow pulse width

a wide beamwidth and a wide pulse width

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

less power required

better resolution

all of the above

reduced sidelobes and clutter

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

315 nm

340 nm

170 nm

630 nm

14. 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?

278 km

258 km

139 km

516 km

Question Bank

Questions for RADAR