Discussion
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- Question
In a FM waveform, the side bands are spaced at intervals equal to
Options- A. four times the modulating frequency
- B. twice the modulating frequency
- C. half the modulating frequency
- D. modulating frequency
- Correct Answer
- half the modulating frequency
- 1. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of
Options- A. Mf
- B. Mf/2
- C. 2Mf
- D. UMf Discuss
- 2. Power spectral density of white noise
Options- A. is constant with frequency
- B. increases with frequency
- C. decreases with frequency
- D. none Discuss
- 3. FM receivers using the standard 88 to 108 MHz band use IF of
Options- A. 8 MHz
- B. 9.9 MHz
- C. 10.7 MHz
- D. 12.2 MHz Discuss
- 4. A padder is basically a/an
Options- A. insulator
- B. variable resistor
- C. capacitor
- D. inductor Discuss
- 5. In a transistor receiver, the use of FET as the first stage amplifier is likely to
Options- A. improve selectivity of the receiver
- B. improve the effectiveness of the AGC
- C. reduce the effect of negative peak clipping
- D. reduce the effect of noise at all frequencies Discuss
- 6. The purpose of incorporating a pre-selector stage in a receiver is to
Options- A. provide higher selectivity
- B. provide higher fidelity
- C. improve linearity
- D. larger passband Discuss
- 7. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
Options- A. facilitate tracking
- B. allow permit adequate frequency coverage without switching
- C. facilitate image frequency rejection
- D. all of the above Discuss
- 8. Low-orbit satellites are not used for communications because they
Options- A. produce sonic booms
- B. do not provide 24 hour/ day contact to the users on Earth
- C. heat up and melt
- D. none Discuss
- 9. In synchronous detection of an AM signal
Options- A. Carrier is completely suppressed
- B. Both side hands are suppressed
- C. Only one side band and part of carrier is suppressed
- D. One side band and full carrier is suppressed Discuss
- 10. The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch.
Options- A. 12
- B. 20
- C. 5
- D. 36 Discuss
Radio Receivers problems
Search Results
Correct Answer: 2Mf
Correct Answer: is constant with frequency
Correct Answer: 10.7 MHz
Correct Answer: inductor
Correct Answer: reduce the effect of negative peak clipping
Correct Answer: provide higher selectivity
Correct Answer: allow permit adequate frequency coverage without switching
Correct Answer: heat up and melt
Correct Answer: Only one side band and part of carrier is suppressed
Correct Answer: 5
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