Top 150+ Solved Communication Engineering MCQ Questions Answer
Q. What the main advantage of PCM?
a. can travel small distances
b. higher bandwidth
c. lower noise
d. good reception
Q. In AM pilot carrier, transmission has
a. carrier and part of one side band
b. two side bands and a carrier
c. two side bands
d. carrier, one side band and part of other side band
Q. Which of the following frequency is not transmitted in AM transmission?
a. upper side band frequency
b. carrier frequency
c. lower side band frequency
d. audio frequency
Q. What is the use of Companding?
a. in pcm transmitters to allow amplitude limiting in the receivers
b. in pcm receiver to overcome impulse noise
c. to overcome quantizing noise in pcm
d. to protect small signals in pcm from quantizing distortion
Q. Which of the following is not an advantage of digital modulation?
a. greater noise immunity
b. greater security
c. easier multiplexing
d. less bandwidth requirement
Q. The performance of modulation scheme is not measured in terms of
a. power efficiency
b. bandwidth efficiency
c. cost and complexity
d. transmitted power
Q. In digital communication system, in order to increase noise immunity, it is necessary to increase
a. signal power
b. signal amplitude
c. signal frequency
d. signal magnitude
Q. Which of the following is the ratio of signal energy per bit to noise power spectral density?
a. bandwidth efficiency
b. spectral density
c. power efficiency
d. power density
Q. Which of the following is the ratio of the throughput data rate per Hertz?
a. bandwidth efficiency
b. spectral density
c. power efficiency
d. power density
Q. Which of the following is defined as the range of frequencies over which the signal has a non zero power spectral density?
a. null to null bandwidth
b. half power bandwidth
c. 3 db bandwidth
d. absolute bandwidth
Q. is equal to width of main spectral lobe.
a. null to null bandwidth
b. half power bandwidth
c. 3 db bandwidth
d. absolute bandwidth