Discussion
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- Question
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%
- Correct Answer
- 84.7%
- 1. 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
- 2. 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
- 3. The source of which of the following noise is different from that of the remaining?
Options- A. Solar noise
- B. Cosmic noise
- C. Galactic noise
- D. Atmospheric noise Discuss
- 4. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is
Options- A. 5870
- B. 3655
- C. 236
- D. 13.3 Discuss
- 5. Fidelity of a receiver represents
Options- A. the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output
- B. the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies
- C. the variation of the output with the modulation frequency when the output impedance is a resistance
- D. none of the above Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. A receiver having poor IF selectivity will also have poor
Options- A. sensitivity
- B. double spotting
- C. blocking
- D. all of the above Discuss
Radio Receivers problems
Search Results
Correct Answer: of constant passband
Correct Answer: all of the above
Correct Answer: Atmospheric noise
Correct Answer: 236
Correct Answer: the variation of the output with the modulation frequency when the output impedance is a resistance
Correct Answer: all of the above
Correct Answer: mixer stage contributes most of the noise generated
Correct Answer: Microphone
Correct Answer: 1910 kHz
Correct Answer: blocking
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