Vayudoot Aviation

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

better resolution

less power required

all of the above

reduced sidelobes and clutter

2. To improve the resolution of a radar display requires

a low frequency and a narrow pulse width

a wide beamwidth and a wide pulse width

a narrow pulse width and a narrow beam width

a high frequency and a large reflector

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

73 nm

270 nm

146 nm

135 nm

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

making regular changes in pulsewidth

limiting the power output of the radar

jittering the PRF

using a different frequency for transmission and reception

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. The bearing of a primary radar is measured by

phase comparison

searchlight principle

lobe comparison

DF techniques

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

beamwidth

power

pulse width

pulse repetition rate

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

13400 pps

12500 pps

6700 pps

25000 pps

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

pulse repetition frequency

pulse width

pulse repetition interval

transmitter power

10. The main advantage of continuous wave radars is

Better range resolution

No maximum range limitation

Better range resolution

No minimum range limitation

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

617 pps

1234 pps

810 pss

1620 pulses per second (pps)

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

16

4

2

8

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

340 nm

170 nm

315 nm

630 nm

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

600 nm

324 nm

300 nm

162 nm

Question Bank

Questions for RADAR