Discussion
Home ‣ Electronics and Communication Engineering ‣ Radio Receivers Comments
- Question
Which of the following produces upper and lower side frequencies?
Options- A. Microphone
- B. Demodulator in a superheterodyne receiver
- C. Modulator in a. radio transmitter
- D. Oscillator in a receiver
- Correct Answer
- Microphone
- 1. In a radio receiver
Options- A. all stages contribute equally to noise
- B. RF stage has no effect on S/N ratio
- C. mixer stage contributes most of the noise generated Discuss
- 2. The problem associated with tuned-radio frequency receiver is
Options- A. instability
- B. insufficient adjacent frequency rejection
- C. bandwidth variation
- D. all of the above Discuss
- 3. 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 efficiency of detection is
Options- A. 34%
- B. 55.5%
- C. 68.8%
- D. 84.7% Discuss
- 4. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because
Options- A. of higher frequency
- B. of lower frequency
- C. of high L/C ratio
- D. of constant passband Discuss
- 5. The sensitivity of a superheterodyne receiver is determined by
Options- A. the gain IF amplifier
- B. the gain of RF amplifier
- C. the noise figure
- D. all of the above Discuss
- 6. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be
Options- A. 1010 kHz
- B. 1455 kHz
- C. 1910 kHz
- D. 545 kHz Discuss
- 7. A receiver having poor IF selectivity will also have poor
Options- A. sensitivity
- B. double spotting
- C. blocking
- D. all of the above Discuss
- 8. The typical squelch circuit
Options- A. cuts off an IF amplifier when the AGC is maximum
- B. cuts off an IF amplifier when the AGC is minimum
- C. cuts off an audio amplifier when the carrier is absent
- D. eliminates the RF interference when the signal is weak Discuss
- 9. Most of the amplification of the received signal is obtained in a superheterodyne receiver from the
Options- A. IF stage
- B. RF stage
- C. power amplification stage
- D. none of the above Discuss
- 10. The household radio receiver uses
Options- A. synchronous
- B. envelope detector
- C. radio detector
- D. none of the above Discuss
Radio Receivers problems
Search Results
Correct Answer: mixer stage contributes most of the noise generated
Correct Answer: all of the above
Correct Answer: 84.7%
Correct Answer: of constant passband
Correct Answer: all of the above
Correct Answer: 1910 kHz
Correct Answer: blocking
Correct Answer: cuts off an audio amplifier when the carrier is absent
Correct Answer: IF stage
Correct Answer: envelope detector
Comments
There are no comments.More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.