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MCQs

Total Questions : 100 | Page 4 of 10 pages
Question 31. The problem associated with tuned-radio frequency receiver is
  1.    instability
  2.    insufficient adjacent frequency rejection
  3.    bandwidth variation
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 32. Which of the following statement about the advantage of phase discriminator over the slope detector is false?
  1.    Fewer tuned circuits
  2.    Better linearity
  3.    Greater limiting
  4.    Much easier alignment
 Discuss Question
Answer: Option C. -> Greater limiting
Answer: (c).Greater limiting
Question 33. Superheterodyne receiver can be used in
  1.    AM
  2.    FM
  3.    SSB
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 34. Fidelity of a receiver represents
  1.    the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output
  2.    the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies
  3.    the variation of the output with the modulation frequency when the output impedance is a resistance
  4.    none of the above
 Discuss Question
Answer: Option C. -> the variation of the output with the modulation frequency when the output impedance is a resistance
Answer: (c).the variation of the output with the modulation frequency when the output impedance is a resistance
Question 35. Which of the following noise becomes of great importance at high frequencies?
  1.    Transit-time noise
  2.    Shot noise
  3.    Flicker noise
  4.    Agitation noise
 Discuss Question
Answer: Option A. -> Transit-time noise
Answer: (a).Transit-time noise
Question 36. The typical squelch circuit
  1.    cuts off an IF amplifier when the AGC is maximum
  2.    cuts off an IF amplifier when the AGC is minimum
  3.    cuts off an audio amplifier when the carrier is absent
  4.    eliminates the RF interference when the signal is weak
 Discuss Question
Answer: Option C. -> cuts off an audio amplifier when the carrier is absent
Answer: (c).cuts off an audio amplifier when the carrier is absent
Question 37. A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. Its channel capacity is
  1.    1.6 kbps
  2.    16 kbps
  3.    32 kbps
  4.    256 kbps
 Discuss Question
Answer: Option B. -> 16 kbps
Answer: (b).16 kbps
Question 38. An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is
  1.    AM-DSB signal with suppressed carrier
  2.    AM-DSB signal with carrier
  3.    AM-SSB signal with carrier
  4.    a sequence of exponentially decaying sine waves
 Discuss Question
Answer: Option B. -> AM-DSB signal with carrier
Answer: (b).AM-DSB signal with carrier
Question 39. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because
  1.    of higher frequency
  2.    of lower frequency
  3.    of high L/C ratio
  4.    of constant passband
 Discuss Question
Answer: Option D. -> of constant passband
Answer: (d).of constant passband
Question 40. The purpose of incorporating a pre-selector stage in a receiver is to
  1.    provide higher selectivity
  2.    provide higher fidelity
  3.    improve linearity
  4.    larger passband
 Discuss Question
Answer: Option A. -> provide higher selectivity
Answer: (a).provide higher selectivity

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