Radar Engineering and Satellite Communication MCQs

Question 1

The antenna used for radar is

Accepted Answer

all of the above

Answer

paraboloidal antenna

Answer

horn fed paraboloid reflectors

Answer

dipole

Question 2

The noise figure of a radar receiver is 12 dB, and its bandwidth is 2.5 Mhz. The value of Pminfor this radar will be

Accepted Answer

1.59 x 10-13 W

Answer

1.59 x 10-9 W

Answer

1.59x 1015W

Answer

1.59x 10-17 W

Question 3

An MTI radar operates at 10 GHz with PRF of 3000 ppps. The lowest blind will be

Accepted Answer

162 lcm/hr

Answer

40 km/hr

Answer

66 km/hr

Answer

81 lcm/hr

Question 4

The delay unit section of the VRM/delay unit can De used to

Accepted Answer

none of the above

Answer

extend the range of radar

Answer

reduce radar interference expand an area for examination

Answer

both (a) & (b)

Question 5

Sea clutter returns occur

Accepted Answer

at short ranges

Answer

due to reflections from rain clouds

Answer

due to land reflections

Answer

none of the above

Question 6

A short pulse transmission on short ranges

Accepted Answer

both (a) & (c)

Answer

provides good minimum range

Answer

provides good bearing resolution

Answer

provides goods range resolution

Question 7

If the 1.5 nm range is selected by the operator, the long-pulse/short pulse control line from the display unit will select a PRT of and a pulse length of

Accepted Answer

1500 Hz, 0.08 is

Answer

1500 Hz, 0.55 us

Answer

750 Hz, 0.08 ilS

Answer

750 Hz, 0.55 us

Question 8

A given lossless antenna produces a beam that is 100 in azimuth and 20? in elevation. The power gain of this antenna would be

Accepted Answer

648/n

Answer

324/7c

Answer

n/50

Answer

200

Question 9

A radar operating at 3 GHz and using a 1 m diameter parabolic reflector antenna with an efficiency factor of (1/7t) would radiate with a power gain of

Accepted Answer

314

Answer

3140

Answer

3.14

Answer

10