Discussion
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- Question
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
- Correct Answer
- High gain and better sensitivity
- 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
- 2. Modulated carrier power in FM
Options- A. increases with modulating signal power
- B. decreases with modulating signal power
- C. is independent of the modulating signal power
- D. none Discuss
- 3. A heterodyne frequency changer is called a
Options- A. Modulator
- B. Mixer
- C. Demodulator
- D. Frequency translator Discuss
- 4. The output of a diode detector contains
Options- A. D.C. voltage
- B. modulating signal
- C. RF ripple
- D. all of the above Discuss
- 5. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?
Options- A. Variable selectivity
- B. Variable sensitivity
- C. Double conversion
- D. Squelch Discuss
- 6. Padders are used in a receiver to
Options- A. discard the carrier
- B. facilitate tracking
- C. filter the input signal
- D. suppress noise Discuss
- 7. 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
- 8. 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
- 9. Standard AM radio broadcasts are confined to
Options- A. MF
- B. HF
- C. VHF
- D. UHF Discuss
- 10. 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
Radio Receivers problems
Search Results
Correct Answer: fsi = fs + 2fi
Correct Answer: is independent of the modulating signal power
Correct Answer: Mixer
Correct Answer: all of the above
Correct Answer: Variable sensitivity
Correct Answer: facilitate tracking
Correct Answer: 455 kHz
Correct Answer: the linearity is worse than in a phase discriminator
Correct Answer: MF
Correct Answer: in the channel
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