Radio Receivers problems
- 1. 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
Correct Answer: 1.116
- 2. 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
Correct Answer: reduce receiver gain at some specific frequency
- 3. 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
Correct Answer: Input noise voltage
- 4. The noise produced by a resistor is proportional to
Options- A. absolute temperature
- B. (absolute temperature)2
- C.
- D.
Discuss
Correct Answer: absolute temperature
- 5. 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
Correct Answer: its operating temperature
- 6. Transistor are free from which type of noise?
Options- A. Resistance noise
- B. Partition noise
- C. Flicker noise
- D. Shot noise Discuss
Correct Answer: Partition noise
- 7. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?
Options- A. Variable tuning inductor
- B. Ganged tuning inductor
- C. Variable capacitor
- D. Variable preset Discuss
Correct Answer: Ganged tuning inductor
- 8. The selectivity of most receivers is determined largely by
Options- A. sensitivity
- B. characteristics of IF section
- C. antenna direction
- D. all of the above Discuss
Correct Answer: characteristics of IF section
- 9. EM 84 tube is used in radio receivers as
Options- A. audio amplifier
- B. RF amplifier
- C. full wave rectifier
- D. magic eye Discuss
Correct Answer: magic eye
- 10. Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz
Options- A. 30, 60 and 70 kHz
- B. 3, 6 and 7 kHz
- C. 30, 60 and 70 MHz
- D. 3, 6 and 7 GHz Discuss
Correct Answer: 30, 60 and 70 MHz
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