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MCQs

Total Questions : 50 | Page 2 of 5 pages
Question 11. An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive
  1.    Single-sideband, suppressed-carrier
  2.    Single-sideband, reduced-carrier
  3.    ISB
  4.    Single-sideband, full-carrier
 Discuss Question
Answer: Option D. -> Single-sideband, full-carrier
Question 12. In a ratio detector
  1.    the linearity is worse than in phase discriminator
  2.    stabilization against signal strength variations is provided
  3.    the output is twice that obtainable from a similar phase discriminator
  4.    the circuit is the same as in a discriminator, except that the diodes are reversed
 Discuss Question
Answer: Option A. -> the linearity is worse than in phase discriminator
Question 13. Three-point tracking is achieved with
  1.    Variable selectivity
  2.    The padder capacitor
  3.    Double spotting
  4.    Double conversion
 Discuss Question
Answer: Option B. -> The padder capacitor
Question 14. Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that
  1.    The receiver cannot use a phase comparator for AFC
  2.    Adjacent-channel rejection is more difficult
  3.    Production of AGC is a rather complicated process
  4.    The transmission is not compatible with A3E
 Discuss Question
Answer: Option B. -> Adjacent-channel rejection is more difficult
Question 15. In a radio receiver with simple AGC
  1.    An increase in signal strength produces more AGC
  2.    The audio stage gain is normally controlled by the AGC
  3.    The faster the AGC time constant the more accurate the output
  4.    The highest AGC voltage is produced
 Discuss Question
Answer: Option A. -> An increase in signal strength produces more AGC
Question 16. To prevent overloading of the IF amplifier in a receiver, one should use
  1.    Squelch
  2.    Variable sensitivity
  3.    Variable selectivity
  4.    Double conversion
 Discuss Question
Answer: Option B. -> Variable sensitivity
Question 17. If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of
  1.    Improving the effectiveness of the AGC
  2.    Reducing the effect of negative-peak clipping
  3.    Reducing the effect of noise at low modulation depths
  4.    Improving the selectivity of the receiver
 Discuss Question
Answer: Option B. -> Reducing the effect of negative-peak clipping
Question 18. Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from
  1.    Gain variation over the frequency coverage range
  2.    Insufficient gain and sensitivity
  3.    Inadequate selectivity at high frequencies
  4.    Instability
 Discuss Question
Answer: Option B. -> Insufficient gain and sensitivity
Question 19. The typical squelch circuit cuts off
  1.    an audio amplifier when the carrier is absent
  2.    RF interference when the signal is weak
  3.    An IF amplifier when the AGC is maximum
  4.    An IF amplifier when the AGC is minimum
 Discuss Question
Answer: Option A. -> an audio amplifier when the carrier is absent
Question 20. When a receiver has good blocking performance, this means that
  1.    It does not suffer from double-spotting
  2.    Its image frequency rejection is poor
  3.    It is unaffected by AGC derived from nearby transmissions
  4.    Its detector suffers from burnout
 Discuss Question
Answer: Option B. -> Its image frequency rejection is poor

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