Analog Communication System MCQs

Question 1

Typical transmitted power of an FDMFM microwave L.O.S. system is

Accepted Answer

1 W

Answer

100 W

Answer

10 kW

Answer

100 kW

Question 2

Which one of the following methods cannot be used for suppressing unwanted side bands in SSB?

Accepted Answer

balanced modulator

Answer

phase-shift method

Answer

'third' method

Answer

filter method

Question 3

In the pilot-carrier system of modulation

Accepted Answer

a pilot-carrier is transmitted with the wanted sideband upper

Answer

sideband is suppressed but full carrier is allowed

Answer

two independent sidebands are allowed with attenuated carrier

Answer

it is necessary to employ transmitters and receivers of excellent frequency stability

Question 4

In S.S.B., the transmitter suppresses

Accepted Answer

carrier and one of the side band frequencies.

Answer

carrier and audio frequency

Answer

audio and one of the side band frequency

Answer

None of above

Question 5

Vestigial sideband (VSB) transmission is exclusively used for

Accepted Answer

video transmission in all TV systems to conserve bandwidth

Answer

HF mobile communications

Answer

long-distance HF radiotelephony

Answer

point-to-point radiotelephony where more than one channel is required

Question 6

Video transmission in TV broadcast is usually on

Accepted Answer

AM

Answer

PM

Answer

FM

Answer

SM

Question 7

For providing two or more voice circuits with the same carrier, it is necessary to use

Accepted Answer

ISB emission

Answer

pilot carrier system

Answer

lincompex

Answer

vestigial sideband transmission

Question 8

A duplexer isa device used to

Accepted Answer

cannect a receiver and a transmitter to the same antenna

Answer

feed more than one receiver from a single antenna

Answer

connect two transmitters to the same antenna

Question 9

Polarisation of radio wave is determined

Accepted Answer

the direction of the electric flux lines w.r.t. the surface of the Earth

Answer

the directivity of the antenna

Answer

the direction of the magnetic flux lines w.r.t. the surface of the Earth.