Discussion
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- Question
FM amplifier in a superheterodyne receiver
Options- A. increases selectivity
- B. suppresses noise
- C. provides improved tracking
- D. improves the rejection of the image frequency
- Correct Answer
- improves the rejection of the image frequency
- 1. Which of the following cannot be used to demodulate SSB?
Options- A. Complete phase-shift generator
- B. Product detector
- C. Diode balanced modulator
- D. Bipolar transistor balanced modulator Discuss
- 2. In a superheterodyne receiver
Options- A. the IF stage has better selectivity than RF stage
- B. the RF stage has better selectivity than IF stage
- C. the RF stage has same selectivity than IF stage
- D. none of the above Discuss
- 3. Neutralization is used in RF amplifiers to
Options- A. stop oscillation
- B. increase bandwidth
- C. improve selectivity
- D. all of the above Discuss
- 4. Which of the following statement about receivers is false?
Options- A. Double conversion is used to improve image rejection
- B. Double conversion is used to improve selectivity
- C. Variable sensitivity is used to improve selectivity
- D. Variable sensitivity is used to eliminate selective fading Discuss
- 5. Which of the following statement about the amplitude limiter is not valid?
Options- A. Leak type bias must be used
- B. Output must be tuned
- C. The circuit is always biased in class C, by virtue of the leak type bias
- D. When the input increases past the threshold of limiting, the gain decreases to keep the output constant 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 rejection ratio at 25 MHz will be
Options- A. 1.116
- B. 1.386
- C. 2.116
- D. 2.386 Discuss
- 7. A notch filter is sometimes used in communication receivers to
Options- A. reduce receiver gain at some specific frequency
- B. increase receiver gain at some specific frequency
- C. made selectivity more precise
- D. spread the bandwidth Discuss
- 8. Which one of the following is not a useful quantity for comparing the noise performance of receivers?
Options- A. Noise figure
- B. Noise temperature
- C. Input noise voltage
- D. Equivalent noise resistance Discuss
- 9. The noise produced by a resistor is proportional to
Options- A. absolute temperature
- B. (absolute temperature)2
- C.
- D.
Discuss
- 10. The noise generated by a resistor depends upon
Options- A. its resistance value
- B. its operating temperature
- C. both its resistance value and operating temperature
- D. none of the above Discuss
Radio Receivers problems
Search Results
Correct Answer: Bipolar transistor balanced modulator
Correct Answer: the IF stage has better selectivity than RF stage
Correct Answer: stop oscillation
Correct Answer: Variable sensitivity is used to eliminate selective fading
Correct Answer: The circuit is always biased in class C, by virtue of the leak type bias
Correct Answer: 1.116
Correct Answer: reduce receiver gain at some specific frequency
Correct Answer: Input noise voltage
Correct Answer: absolute temperature
Correct Answer: its operating temperature
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