Radar Engineering and Satellite Communication MCQs

Question 1

While discussing sharing of a communication satellite by many geographically dispersed Earth stations, DAMA means

Accepted Answer

demand-assigned multiple access

Answer

decibel attenuated microwave antenna

Answer

digital analog master antenna

Answer

dynamically-assigned multiple access

Question 2

Radio broadcasting is a familiar example of

Accepted Answer

frequency multiplexing

Answer

space multiplexing

Answer

time multiplexing

Answer

none of the above

Question 3

A modem is

Accepted Answer

an electronic circuit which carries out modulation and demodulation of a carrier frequency

Answer

a form of comutator

Answer

a device for digitizing speech

Answer

a circuit used for suppressing microwave interference

Question 4

In the case of a 70-MHz IF carrier for a tansponder bandwidth of 36 MHz, energy must lie between ?MHz.

Accepted Answer

52 and 88

Answer

34 and 106

Answer

106 and 142

Answer

34 and 142

Question 5

In synchronous detection of an AM signal

Accepted Answer

only one side band and part of carrier is suppressed

Answer

carrier is completely suppressed

Answer

both side bands are suppressed

Answer

one side band and full carrier is suppressed

Question 6

In envelope detection of an AM waveform

Accepted Answer

both side bands and full-amplitude carrier are needed

Answer

one side band and full-amplitude carrier are needed

Answer

only two side bands are needed

Answer

upper side band and part of carrier are needed

Question 7

Phase modulation is commonly used for data transmission mainly because

Accepted Answer

it is resistant to the effects of noise

Answer

phase can be varied from +180? to ?180?

Answer

demodulation is very easy

Answer

it gives highest data rates that can be transmitted over a given channel

Question 8

For satellite transmission, analog signals may be converted into digital form with the help of

Accepted Answer

codec

Answer

modem

Answer

transponder

Answer

compandor

Question 9

Orbital disturbances of a geosynchronous satellite are caused by the

Accepted Answer

all of the above

Answer

Moon

Answer

Sun

Answer

Earth