Analog Communication System MCQs

Question 1

Identical peak amplitudes. It there is no correction network, FM signal for A shall have a smaller frequency deviation than that for B. Comment !

Accepted Answer

This is not possible

Answer

This thing can happen only under special circumstances

Answer

The statement is absolutely true

Answer

Both the signals have identical frequency deviation

Question 2

Is it possible to generate FM signal from a PM signal?

Accepted Answer

not always

Answer

yes

Answer

no

Answer

none of these

Question 3

Signals A and B frequency modulate a carrier with Armstrong technique. Signals A and B respectively have frequencies of 10 kHz and 16 kHz with

Accepted Answer

NBPM signal

Answer

an AM signal

Answer

NBFM signal

Answer

none of these

Question 4

Chief advantage of Armstrong modulator is that

Accepted Answer

the centre frequency (carrier frequency when unmodulated) is extremely stable

Answer

it is capable of producing WBFM (Wide Band FM signals)

Answer

a large depth of modulation can be achieved

Answer

none of these

Question 5

In a communication system noise effects the signal mostly

Accepted Answer

in the channel

Answer

at the destination

Answer

in the information source

Answer

at the transmitter

Question 6

Which of the following statements is incorrect?Modulation is used to

Accepted Answer

reduce the bandwidth

Answer

allow the use of practical antennas

Answer

separate differing transmissions

Answer

ensure intelligence to be transmitted over long distances

Question 7

Communication consits of electrical means of information.

Accepted Answer

all of the above

Answer

sending

Answer

receiving

Answer

processing

Question 8

Ampntude modulation is used for broadcasting because as compared to other systems

Accepted Answer

its use avoids receiver complexity

Answer

it can provide the necessary bandwidth for high fidelity

Answer

it requires less transmitting power

Answer

it is more immune to noise

Question 9

The difference between phase and frequency modulation

Accepted Answer

lies in the different difinition of the modulation index

Answer

is too great to make the two systems compatible

Answer

is purely theoretical because they are the same in practice

Answer

lies in the poorer radio response of phase modulation index