Analog Communication System MCQs

Question 1

If the output power of radio receiver is doubled, the volume is increased by

Accepted Answer

3 dB

Answer

?3 dB

Answer

1 dB

Answer

2 dB

Question 2

In a radio the IF amplifier

Accepted Answer

is fixed-tuned to one particular frequency

Answer

can be tuned to various station frequencies

Answer

is tuned above the station's incoming frequency

Answer

amplifiers the output of loacal oscillator

Question 3

Detection in a superheterodyne radio receiver takes place

Accepted Answer

preceding audio amplifiers

Answer

following audio amplifiers

Answer

preceding IF amplifiers

Answer

in the aerial itself

Question 4

Receiver having poorer IF selectivity will have pooer

Accepted Answer

blocking

Answer

sensitivity

Answer

diverse reception

Answer

all of the above

Question 5

With 100 per cent modulation, ratio of sideband power to total power transmitted in an amplitude-modulated wave is

Accepted Answer

one-third

Answer

one-fourth

Answer

one-half

Answer

two-third

Question 6

Very high IF has

Accepted Answer

both (a) and (b)

Answer

poor selectivity

Answer

very good image frequency rejection

Answer

none of the above

Question 7

The local oscillator of a receiver is tuned to a frequency higher than the incoming frequency to

Accepted Answer

produce IF

Answer

help image frequency rejection

Answer

permit ease in tracking

Answer

allow adequate frequency coverage without switching

Question 8

In a radio receiver AGC is used to

Accepted Answer

maintain the carrier level at the second detector input constant

Answer

improve selectivity of the receiver

Answer

improve noise figure of the receiver

Answer

maintain the carrier level at the second detector intput variable

Question 9

In an AM transmitter after the modulation stage, class-C amplifier

Accepted Answer

cannot be used

Answer

can be used

Answer

either of the above

Answer

both (a) and (b)