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MCQs

Total Questions : 1236 | Page 4 of 124 pages
Question 31. Low frequency boost can be easily compensated by
  1.    attenuating the frequencies from 0 to 1.25 MHz
  2.    using an appropriate de-emphasis circuit in the receiver
  3.    using an appropriate pre-emphasis circuit in the transmitter
  4.    none
 Discuss Question
Answer: Option A. -> attenuating the frequencies from 0 to 1.25 MHz
Answer: (a).attenuating the frequencies from 0 to 1.25 MHz
Question 32. The smallest change in sound intensity that can be detected by human ear is __________ dB.
  1.    1
  2.    3
  3.    10
  4.    20
 Discuss Question
Answer: Option B. -> 3
Answer: (b).3
Question 33. When a complex signals is used to frequency modulate a carrier, the resulting sideband distribution is
  1.    symmetrical about the carrier
  2.    not necessarily symmetrical about the carrier
  3.    decided by the predominant sidebands
  4.    none of the above
 Discuss Question
Answer: Option A. -> symmetrical about the carrier
Answer: (a).symmetrical about the carrier
Question 34. If e = 10 sin(10⁸ t + 3 sin 10⁴ t) then the deviation is
  1.    4.77 kHz
  2.    47.7 kHz
  3.    477 kHz
  4.    4770 kHz
 Discuss Question
Answer: Option B. -> 47.7 kHz
Answer: (b).47.7 kHz
Question 35. An MTI compares a set of received echos with those received during the previous sweep.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 36. In a system using QASK and 4 bits to form a symbol, the required bandwidth is
  1.    same as BPSK
  2.    half of that in BPSK
  3.    one-fourth of that in BPSK
  4.    none of the above
 Discuss Question
Answer: Option C. -> one-fourth of that in BPSK
Answer: (c).one-fourth of that in BPSK
Question 37. To avoid objectionable noise in a microwave TV link, the SNR should be about
  1.    50 or more
  2.    10 or more
  3.    25 or more
  4.    200 or more
 Discuss Question
Answer: Option C. -> 25 or more
Answer: (c).25 or more
Question 38. Each of the following statements regarding frequency modulation is true except
  1.    amplitude of the modulated wave remains the same as that of carrier wave
  2.    the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal
  3.    the rate at which the frequency of modulated wave varies is determined by the frequency of the modulating signal
  4.    frequency of modulated wave increases as the signal voltage increases and vice-versa
 Discuss Question
Answer: Option B. -> the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal
Answer: (b).the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal
Question 39. Assertion (A): Radio transmission is by sky waves
Reason (R): Waves having frequencies higher than 30 MHz penetrate the atmosphere and do not return to earth.
  1.    Both A and R are correct and R is correct explanation of A
  2.    Both A and R are correct but R is not correct explanation of A
  3.    A is correct but R is wrong
  4.    A is wrong but R is correct
 Discuss Question
Answer: Option B. -> Both A and R are correct but R is not correct explanation of A
Answer: (b).Both A and R are correct but R is not correct explanation of A
Question 40. During playback the take up reel is
  1.    in clockwise motion
  2.    in anticlockwise motion
  3.    either clockwise or anticlockwise motion
  4.    none of the above
 Discuss Question
Answer: Option B. -> in anticlockwise motion
Answer: (b).in anticlockwise motion

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