Communication Engineering MCQs with answers Page - 3

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Q. Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. AM demodulation technique can be divided into ______ and ______ demodulation.

  • (A) direct, indirect
  • (B) slope detector, zero crossing
  • (C) coherent, noncoherent
  • (D) quadrature detection, coherent detection

A

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Q. FFSR in AM systems stands for

  • (A) feedforward signal regeneration
  • (B) feedbackward signal regeneration
  • (C) feedbackward system restoration
  • (D) feedforward system restoration

A

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Q. Which modulation scheme is preferred for direct sequence spread spectrum process?

  • (A) bpsk
  • (B) qpsk
  • (C) bpsk & qpsk
  • (D) none of the mentioned

A

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Q. The processing gain is given as modulation scheme.

  • (A) wss/r
  • (B) r/wss
  • (C) wss/2r
  • (D) r/2wss

A

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Q. The minimum spacing between consecutive hop positions gives the

  • (A) minimum number of chips necessary
  • (B) maximum number of chips necessary
  • (C) chip rate
  • (D) none of the mentioned

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Q. Which system allows larger processing gain?

  • (A) direct sequence
  • (B) frequency hopping
  • (C) direct sequence & frequency hopping
  • (D) none of the mentioned

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Q. In which technique is phase coherence hard to maintain?

  • (A) direct sequence
  • (B) frequency hopping
  • (C) direct sequence & frequency hopping
  • (D) none of the mentioned

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Q. Which type of demodulator is used in the frequency hopping technique?

  • (A) coherent
  • (B) non coherent
  • (C) coherent & non coherent
  • (D) none of the mentioned

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Q. Robustness gives the inability of a signal to withstand the impairments.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

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