Discussion
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- Question
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
- Correct Answer
- is independent of the modulating signal power
- 1. A heterodyne frequency changer is called a
Options- A. Modulator
- B. Mixer
- C. Demodulator
- D. Frequency translator Discuss
- 2. The output of a diode detector contains
Options- A. D.C. voltage
- B. modulating signal
- C. RF ripple
- D. all of the above Discuss
- 3. 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
- 4. RF amplifiers are used in radio receivers for
Options- A. improved image frequency rejection
- B. improved rejection of adjacent unwanted signals
- C. prevention of re-radiation of the local oscillator through the antenna of the receiver
- D. all of the above Discuss
- 5. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is
Options- A. 114 kW
- B. 336 kW
- C. 384 kW
- D. 455 kW Discuss
- 6. 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
- 7. 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
- 8. Padders are used in a receiver to
Options- A. discard the carrier
- B. facilitate tracking
- C. filter the input signal
- D. suppress noise Discuss
- 9. 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
- 10. 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
Radio Receivers problems
Search Results
Correct Answer: Mixer
Correct Answer: all of the above
Correct Answer: Variable sensitivity
Correct Answer: all of the above
Correct Answer: 336 kW
Correct Answer: fsi = fs + 2fi
Correct Answer: High gain and better sensitivity
Correct Answer: facilitate tracking
Correct Answer: 455 kHz
Correct Answer: the linearity is worse than in a phase discriminator
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