Communication Engineering MCQs with answers Page - 9

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Q. A linear feedback shift register consists of

  • (A) feedback path
  • (B) modulo 2 adder
  • (C) four stage register
  • (D) all of the mentioned

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Q. If the initial pulse of 1000 is fed to shift register, after how many clock pulses does the sequence repeat?

  • (A) 15
  • (B) 16
  • (C) 14
  • (D) 17

A

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Q. The sequences produced by shift register depends on

  • (A) number of stages
  • (B) feedback tap connections
  • (C) initial conditions
  • (D) all of the mentioned

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Q. For maximal length sequence, the sequence repetition clock pulses p is given by

  • (A) 2n + 1
  • (B) 2n -1
  • (C) 2n
  • (D) none of the mentioned

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Q. For any cyclic shift, the auto-correlation function is equal to

  • (A) 1/p
  • (B) -1/p
  • (C) –p
  • (D) p

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Q. Which method is better?

  • (A) to share same bandwidth
  • (B) to share different bandwidth
  • (C) to share same & different bandwidth
  • (D) none of the mentioned

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Q. Pulse jammer consists of

  • (A) pulse modulated excess band noise
  • (B) pulse modulated band-limited noise
  • (C) pulse width modulated excess band noise
  • (D) pulse width modulated band-limited noise

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Q. Which are the design options for anti jam communicator?

  • (A) time diversity
  • (B) frequency diversity
  • (C) special discrimination
  • (D) all of the mentioned

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Q. The ratio (J/S)reqd gives the measure of

  • (A) vulnerability to interference
  • (B) invulnerability to interference
  • (C) all of the mentioned
  • (D) none of the mentioned

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Q. The system should have

  • (A) larger (j/s)reqd
  • (B) greater system’s noise rejection capability
  • (C) larger (j/s)reqd & greater system’s noise rejection capability
  • (D) none of the mentioned

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