Radar Engineering and Satellite Communication MCQs

Question 1

The Doppler frequency is large if

Accepted Answer

the relative velocity of target with respect to radar is large

Answer

the transmitted frequency is small

Answer

the size of the antenna is large

Answer

the relative velocity of target with 6. respect to radar is small

Question 2

If peak transmitted power in a radar system is increased 16 times, its maximum range will be increased by a factor of

Accepted Answer

2

Answer

4

Answer

8

Answer

16

Question 3

Radar range primarily depends upon

Accepted Answer

peak transmitted power

Answer

average transmitted power

Answer

independent of transmitted power

Answer

distance between ends

Question 4

Which statement(s) regarding the working of a radar system is/are wrong?

Accepted Answer

Both B and C

Answer

maximum range is proportional to the square-root of the capture area of the receiving antenna

Answer

maximum range is inversely proportional to the diameter if wavelength is kept constant

Answer

maximum radar range is independent of the effective target area

Question 5

In a radar transmitter, the function of modulator is to

Accepted Answer

switch the tube OFF and ON as required

Answer

allow the use of same antenna for transmission and reception

Answer

control pulse repetition frequency (PRF)

Answer

increase maximum range of the radar

Question 6

The resolution of a pulsed radar can be improved by

Accepted Answer

decreasing pulse width

Answer

increasing pulse width

Answer

increasing the pulse amplitude

Answer

decreasing the pulse repetition frequency

Question 7

The thermal-noise power generated by a receiver of bandwidth Bn (in hertz) at a temperature T (degrees kelvin) is where k is the Boltzann's constant

Accepted Answer

kTBn

Answer

kT2Bn

Answer

ckTBn

Answer

kT/13n

Question 8

If the transmitted waveform is a train of rectangular pulses of width 2 microseconds, the pulse repetition period is 1 millisecond and the peak power is 10 kilowatts, theaverage power is

Accepted Answer

20

Answer

2

Answer

200

Answer

2000

Question 9

If a radar is to have a range of 50 nmi (92.6 km), pulse interval should be microsecond.

Accepted Answer

620

Answer

500

Answer

400

Answer

250