Q. A linear feedback shift register consists of
✅ Correct Answer: (D)
all of the mentioned
Explanation: a linear feedback shift register
Communication Engineering MCQs | Page - 9
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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?
✅ Correct Answer: (A)
15
Explanation: if the initial pulse 1000 is given to shift register, the foregoing sequence repeats after 15 clock pulses.
Q. The sequences produced by shift register depends on
✅ Correct Answer: (D)
all of the mentioned
Explanation: the sequences produced by shift register depends on the number of stages, the feedback tap connections and initial conditions.
Q. For maximal length sequence, the sequence repetition clock pulses p is given by
✅ Correct Answer: (B)
2n -1
Explanation: for maximal length sequence, produced by n stage linear feedback shift register the sequence repetition clock pulses p is given by 2n -1 .
Q. For any cyclic shift, the auto-correlation function is equal to
✅ Correct Answer: (B)
-1/p
Explanation: for any cyclic shift the auto- correlation function is equal to -1/p.
Q. Which method is better?
✅ Correct Answer: (B)
to share different bandwidth
Explanation: if the jammer noise shares the same bandwidth, the result could be destructive.
Q. Pulse jammer consists of
✅ Correct Answer: (B)
pulse modulated band-limited noise
Explanation: pulse jammer consists of pulse modulated band-limited noise.
Q. Which are the design options for anti jam communicator?
✅ Correct Answer: (D)
all of the mentioned
Explanation: the design options for anti-jam communicator are time diversity, frequency diversity and special discrimination.
Q. The ratio (J/S)reqd gives the measure of
✅ Correct Answer: (B)
invulnerability to interference
Explanation: the ratio (j/s)reqd gives the measure of how invulnerable the system is to interference.
Q. The system should have
✅ Correct Answer: (C)
larger (j/s)reqd & greater system’s noise rejection capability
Explanation: the system will be efficient if it has greater (j/s)reqd and larger system’s noise rejection capability.
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