Radar Engineering and Satellite Communication MCQs

Question 1

The maximum signal propagation time of a geosynchronous satellite transmission is about millisecond.

Accepted Answer

270

Answer

540

Answer

135

Answer

1080

Question 2

A telephone user while talking to a person via a satellite has to wait for reply for about millisecond.

Accepted Answer

540

Answer

100

Answer

270

Answer

470

Question 3

The echo heard by a telephone user on a satellite channel can be removed by using

Accepted Answer

echo suppressor

Answer

a vocoder

Answer

a multiplexer

Answer

digital techniques

Question 4

A satellite link uses different frequencyies for receiving and transmitting in order to

Accepted Answer

avoid interference between its powerful transmitted signal and weak incoming signal

Answer

avoid interference from terrestrial microwave links

Answer

minimise free-space losses

Answer

maximise antenna gain

Question 5

The expression for satellite link frequencies such as 4/6 GHz denotes that

Accepted Answer

4 GHz is the down-link and 6 GHz is the up-link frequency

Answer

4 GHz is the up-link and 6 GHz is the down-link frequency

Answer

the system operates at a mean fre quency of 5 GHz

Answer

one frequency is used as a back up for the other

Question 6

At present, the radio-frequency band mainly used by most satellites is

Accepted Answer

SHF

Answer

EHF

Answer

UHF

Answer

VHF

Question 7

The lowest frequency used in satellite communications is GHz.

Accepted Answer

0.8

Answer

3

Answer

18

Answer

30

Question 8

A transponder is a satellite equipment which

Accepted Answer

does all the above-mentioned functions

Answer

receives a signal from Earth station and amplifiers it

Answer

changes the frequency of the received signal

Answer

retransmits the received signal

Question 9

The angle subtended by Earth as geostationary communication satellite is

Accepted Answer

17.34?

Answer

51.4?

Answer

120?

Answer

60?