Radar Engineering and Satellite Communication MCQs

Question 1

The lowest 'blind speed' of a radar erating at 6 GHz with a PRF of 1000 pps is ? m/s

Accepted Answer

50

Answer

6000

Answer

166.7

Answer

100

Question 2

Which statement regarding CW Doppler radar is wrong?

Accepted Answer

it is capable of measuring target range

Answer

it does not use duplexer

Answer

it gives continuous transmission

Answer

it gives accurate measurement of relative velocity

Question 3

Blind speeds in M.T.I. radar result in

Accepted Answer

restrictionin speed of detectable targets

Answer

blanking of PPI

Answer

no change in phase detector output

Answer

none of above

Question 4

A simple CW radar does not give range information because

Accepted Answer

the continuous echo cannot be associated with any specific part of the transmitted wave

Answer

it uses the principle of Doppler shift

Answer

CW waves do not get reflected from a target

Answer

None of the above

Question 5

The major advantage of pulsed radar over CW radar is that

Accepted Answer

pulsed radar readily gives the range of target while CW radar cannot give range information

Answer

pulsed radar can indentify a target more easily than CW radar

Answer

pulses get reflected from the target more efficiently as compared to CW waves

Answer

None of the above

Question 6

Radar transmits pulsed electromagnetic energy because

Accepted Answer

it provides a very ready measurement of range

Answer

it is easy to measure the direction of the target

Answer

it is very easy to identify the targets

Answer

None of the above

Question 7

Magnetrons are commonly used as radar transmitters because

Accepted Answer

high power can be generated and transmittedto aerial directly from oscillator

Answer

it is easily cooled it is a cumbersome device

Answer

all the above

Question 8

If the 'Noise Figure' of receiver A is better than 'Noise Figure' of receiver B, it implies that S/N ratio of

Accepted Answer

receiver A is better than that of receiver B

Answer

receiver A is poorer than that of receiver B

Answer

receivers A and B depends on their individual bandwidths.

Answer

None of the above

Question 9

A CW-FM radar can measure

Accepted Answer

relative velocity and range

Answer

only relative velocity

Answer

only range

Answer

relative velocity, range and size of target