Discussion
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- Question
Selectivity varies with receiving frequency, frequency is raised.
Options- A. Somewhat better when the receiving frequency is raised
- B. Somewhat better at intermediate frequency
- C. Somewhat worse when the receiving frequency is lowered
- D. Somewhat worse when the receiving frequency is raised
- Correct Answer
- Somewhat worse when the receiving frequency is raised
- 1. Double spotting in a receiver is due to
Options- A. poor sensitivity of RF amplifier
- B. high gain of IF amplifier
- C. inadequate image frequency rejection
- D. all of the above Discuss
- 2. Noise limiter is provided on AM receivers to
Options- A. reduce interfering noise due to ignition system
- B. reduce noise due to electrical storms
- C. reduce interference due to electrical machinery
- D. all of the above Discuss
- 3. An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is
Options- A. AM-DSB signal with suppressed carrier
- B. AM-DSB signal with carrier
- C. AM-SSB signal with carrier
- D. a sequence of exponentially decaying sine waves Discuss
- 4. A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. Its channel capacity is
Options- A. 1.6 kbps
- B. 16 kbps
- C. 32 kbps
- D. 256 kbps Discuss
- 5. 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. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is
Options- A. Armstrong oscillator
- B. Colpitts oscillator
- C. Clapp oscillator
- D. Ultra Audio oscillator Discuss
- 6. Which curve represents the fidelity curve of a standard receiver?
Options- A. Curve A
- B. Curve B
- C. Curve C
- D. Curve D Discuss
- 7. The passband of the tuned circuits of a radio receiver should be equal to
Options- A. 20 kHz
- B. 455 kHz
- C. 1455 kHz
- D. more than 455 kHz Discuss
- 8. Which of the following circuit cannot be used to demodulate SSB?
Options- A. Phase discriminator
- B. Produce detector
- C. Balanced modulator
- D. Beat frequency oscillator Discuss
- 9. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is
Options- A. 555 kHz
- B. 1010 kHz
- C. 1465 kHz
- D. 1920 kHz Discuss
- 10. RF amplifiers are used in radio receivers for
Options- A. better sensitivity
- B. improved signal-to-noise ratio
- C. better coupling of receiver to the antenna
- D. all of the above Discuss
Radio Receivers problems
Search Results
Correct Answer: inadequate image frequency rejection
Correct Answer: all of the above
Correct Answer: AM-DSB signal with carrier
Correct Answer: 16 kbps
Correct Answer: Armstrong oscillator
Correct Answer: Curve C
Correct Answer: 20 kHz
Correct Answer: Phase discriminator
Correct Answer: 1465 kHz
Correct Answer: all of the above
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