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MCQs

Total Questions : 260 | Page 2 of 26 pages
Question 11. . A VHF amplifier has a noise factor of 10 dB. The prportion of the amplifier's output noise which is internally generated is
  1.    1/10
  2.    9/10
  3.    1/2
  4.    1/4
 Discuss Question
Answer: Option B. -> 9/10
Question 12. . For a pulse width of 1 fts in a tracking radar, the minimum distance of the target must be metre.
  1.    150
  2.    300
  3.    500
  4.    75
 Discuss Question
Answer: Option A. -> 150
Question 13.  The signal-to-quantisation noise ratio in a PCM system depends upon
  1.    sampling rate
  2.    number of quantisation levels
  3.    message signal bandwidth
  4.    none of the above
 Discuss Question
Answer: Option B. -> number of quantisation levels
Question 14. . To transmit N signals each band-limited to fm hertz by TDM will require a minimum bandwidth of hertz.
  1.    fm
  2.    2 fm
  3.    N fm
  4.    2fm
 Discuss Question
Answer: Option C. -> N fm
Question 15. . A TDM system
  1.    needs lower bandwidth
  2.    gives low signal-to-noise ratio
  3.    uses simpler circuits as compared to FDM systems
  4.    all the above
 Discuss Question
Answer: Option B. -> gives low signal-to-noise ratio
Question 16. . It there are C channels, each being sampled at S samples per second with each sample producing an N-bit code, the encoder bit rate B is
  1.    B=CxS/N
  2.    B = C x N/S
  3.    B=CxSxN
  4.    B =N/C x S
 Discuss Question
Answer: Option C. -> B=CxSxN
Question 17. . The most recent internationally accepted PCM system operating over wire pairs is the 30 speech channel system specified by CCITT in Geneva in 1972. Using a sampling rate of 8 kHz and an 8-bit code, the line rate in megabits per second would be
  1.    2.048
  2.    1.92
  3.    0.032
  4.    0.024
 Discuss Question
Answer: Option A. -> 2.048
Question 18. . The telegraph circuit in which two messages can be transmitted in the same direction is called
  1.    half duplex
  2.    duplex
  3.    diplex
  4.    quadruplex
 Discuss Question
Answer: Option B. -> duplex
Question 19. . For transmission of normal speech signal, the PCM channel needs a bandwidth of kHz.
  1.    64
  2.    8
  3.    4
  4.    2
 Discuss Question
Answer: Option C. -> 4
Question 20. . A binary system linking teletypewriters to a computer operates at a mean frequency of 1080 Hz shifting to 980 Hz when a one is transmitted and to 1180 Hz for a zero. The maximum permitted data rate for this system is
  1.    200 bits/s
  2.    200 baud
  3.    100 baud
  4.    1080 bits/s
 Discuss Question
Answer: Option B. -> 200 baud

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