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
modulated
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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