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