Radio Receivers problems
- 1. When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is given by
Options- A. fsi = fs - 2fi
- B. fsi = fs + 2fi
- C.
- D.
Discuss
Correct Answer: fsi = fs + 2fi
- 2. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?
Options- A. High gain and better sensitivity
- B. Better selectivity at high frequencies
- C. Stability
- D. Noise suppression Discuss
Correct Answer: High gain and better sensitivity
- 3. Padders are used in a receiver to
Options- A. discard the carrier
- B. facilitate tracking
- C. filter the input signal
- D. suppress noise Discuss
Correct Answer: facilitate tracking
- 4. Most popular IF for receivers tuning to 540 to 1650 kHz is
Options- A. 433 kHz
- B. 455 kHz
- C. 545 kHz
- D. 555 kHz Discuss
Correct Answer: 455 kHz
- 5. In a ratio detector
Options- A. the linearity is worse than in a phase discriminator
- B. the output is twice that obtainable from a similar phase discriminator
- C. stabilization against signal strength variations is provided
- D. the circuit is the same as in a discriminator, except that the diodes are reversed Discuss
Correct Answer: the linearity is worse than in a phase discriminator
- 6. Standard AM radio broadcasts are confined to
Options- A. MF
- B. HF
- C. VHF
- D. UHF Discuss
Correct Answer: MF
- 7. In a communication system, noise is most likely to affect the signal
Options- A. at the transmitter
- B. in the channel
- C. in the information source
- D. at the destination Discuss
Correct Answer: in the channel
- 8. In a receiver, which of the following device has IF input but RF output?
Options- A. Demodulator
- B. Loudspeaker
- C. Audio amplifier
- D. Frequency changer Discuss
Correct Answer: Demodulator
- 9. Which of the following noise does not occur in transistors?
Options- A. Partition noise
- B. Shot noise
- C. Flicker noise
- D. Resistance noise Discuss
Correct Answer: Partition noise
- 10. A transmitter serial current contains
Options- A. carrier frequencies
- B. audio frequencies
- C. radio frequencies
- D. none of the above Discuss
Correct Answer: radio frequencies
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