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MCQs

Total Questions : 50 | Page 4 of 5 pages
Question 31. Three-point tracking is achieved with
  1.    The padder capacitor
  2.    Double spotting
  3.    Variable selectivity
  4.    Double conversion
 Discuss Question
Answer: Option A. -> The padder capacitor
Question 32. Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that
  1.    Adjacent-channel rejection is more difficult
  2.    The receiver cannot use a phase comparator for AFC
  3.    Production of AGC is a rather complicated process
  4.    The transmission is not compatible with A3E
 Discuss Question
Answer: Option A. -> Adjacent-channel rejection is more difficult
Question 33. An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive
  1.    Single-sideband, full-carrier
  2.    Single-sideband, suppressed-carrier
  3.    Single-sideband, reduced-carrier
  4.    ISB
 Discuss Question
Answer: Option A. -> Single-sideband, full-carrier
Question 34. In a ratio detector
  1.    stabilization against signal strength variations is provided
  2.    the circuit is the same as in a discriminator, except that the diodes are reversed
  3.    the output is twice that obtainable from a similar phase discriminator
  4.    the linearity is worse than in phase discriminator
 Discuss Question
Answer: Option D. -> the linearity is worse than in phase discriminator
Question 35. In a radio receiver with simple AGC
  1.    The faster the AGC time constant the more accurate the output
  2.    The audio stage gain is normally controlled by the AGC
  3.    An increase in signal strength produces more AGC
  4.    The highest AGC voltage is produced
 Discuss Question
Answer: Option C. -> An increase in signal strength produces more AGC
Question 36. To prevent overloading of the IF amplifier in a receiver, one should use
  1.    Variable selectivity
  2.    Double conversion
  3.    Variable sensitivity
  4.    Squelch
 Discuss Question
Answer: Option C. -> Variable sensitivity
Question 37. The typical squelch circuit cuts off
  1.    RF interference when the signal is weak
  2.    An IF amplifier when the AGC is maximum
  3.    An IF amplifier when the AGC is minimum
  4.    an audio amplifier when the carrier is absent
 Discuss Question
Answer: Option D. -> an audio amplifier when the carrier is absent
Question 38. When a receiver has good blocking performance, this means that
  1.    Its detector suffers from burnout
  2.    It is unaffected by AGC derived from nearby transmissions
  3.    It does not suffer from double-spotting
  4.    Its image frequency rejection is poor
 Discuss Question
Answer: Option D. -> Its image frequency rejection is poor
Question 39. Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from
  1.    Instability
  2.    Gain variation over the frequency coverage range
  3.    Inadequate selectivity at high frequencies
  4.    Insufficient gain and sensitivity
 Discuss Question
Answer: Option D. -> Insufficient gain and sensitivity
Question 40. If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of
  1.    Reducing the effect of noise at low modulation depths
  2.    Improving the selectivity of the receiver
  3.    Improving the effectiveness of the AGC
  4.    Reducing the effect of negative-peak clipping
 Discuss Question
Answer: Option D. -> Reducing the effect of negative-peak clipping

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