Communication System VIVA Questions and Answers Pdf - 1

Question: 1

Crystal controlled oscillator generates

(A) medium frequency wave

(B) low frequency carrier wave

(C) voice frequency wave

(D) high frequency carrier wave

Question: 2

Audio signals are converted into sound signal using

(A) amplifiers

(B) gramophone

(C) microphone

(D) loudspeaker

Question: 3

The electromagnetic waves entering into the ionosphere are _____ by the ionosphere.

(A) diffracted and polarized

(B) polarised

(C) refracted

(D) diffracted

Question: 4

A modem converts

(A) analog signal into radio signal

(B) audio signal into electrical signal

(C) digital signal into analog signal

(D) digital signal into hybrid signal

Question: 5

Printed documents to be transmitted by fax are converted into electrical signals by the process of

(A) light variation

(B) modulation

(C) scanning

(D) reflection