Q. Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver.
✅ Correct Answer: (B)
false
Communication Engineering MCQs | Page - 3
Dear candidates you will find MCQ questions of Communication Engineering here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. AM demodulation technique can be divided into ______ and ______ demodulation.
✅ Correct Answer: (C)
coherent, noncoherent
Q. Which modulation scheme is preferred for direct sequence spread spectrum process?
✅ Correct Answer: (C)
bpsk & qpsk
Explanation: both the modulation scheme bpsk and qpsk can be used for direct sequence spread spectrum process.
Q. The processing gain is given as modulation scheme.
✅ Correct Answer: (A)
wss/r
Explanation: the processing gain is given by
Q. The minimum spacing between consecutive hop positions gives the
✅ Correct Answer: (A)
minimum number of chips necessary
Explanation: the minimum spacing between consecutive hop positions given the minimum number of chips necessary in the frequency word.
Q. Which system allows larger processing gain?
✅ Correct Answer: (B)
frequency hopping
Explanation: frequency hopping spread spectrum system allows greater processing gain than direct sequence spread spectrum technique.
Q. In which technique is phase coherence hard to maintain?
✅ Correct Answer: (B)
frequency hopping
Explanation: in frequency hopping spread spectrum phase coherence is hard to maintain from hop to hop.
Q. Which type of demodulator is used in the frequency hopping technique?
✅ Correct Answer: (B)
non coherent
Explanation: as it is difficult to maintain phase coherence, non coherent demodulator is used.
Q. Robustness gives the inability of a signal to withstand the impairments.
✅ Correct Answer: (B)
false
Explanation: robustness gives the ability of a signal to withstand the impairments such as noise, jamming etc.
Jump to