Communication System Multiple Choice Questions and Answers Pdf - 1

Question: 1

Which one of the following is not a useful quantity for comparing the noise performance of receivers?

(A) noise figure

(B) noise temperature

(C) equivalent noise resistance

(D) input noise voltage

Ans: D

input noise voltage

Question: 2

The communication medium causes the signal to be

(A) amplified

(B) attenuated

(C) interfered with

(D) modulated

Ans: D


Question: 3

The very high frequency (VHF) range extends from

(A) 3-30 MHz

(B) 30-300 MHz

(C) 300-3000 MHz

(D) 3000-30,000 MHz

Ans: D

3000-30,000 MHz

Question: 4

Radio signals are made up of

(A) noise and data

(B) electrons and protons

(C) electric and magnetic fields

(D) voltage and currents

Ans: D

voltage and currents

Question: 5

The function of the input transducer in a communication system is

(A) to convert message sound signal into electrical signal

(B) to modulate the message signal

(C) to transmit the message signal

(D) none of the above

Ans: B

to modulate the message signal

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