Discussion
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- Question
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
- Correct Answer
- AM-DSB signal with carrier
- 1. 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
- 2. 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
- 3. In radio receiver, the maximum contribution to noise is from
Options- A. mixer stage
- B. power supply
- C. power amplifier
- D. equally from above three Discuss
- 4. A trimmer is basically a
Options- A. insulator
- B. inductor
- C. capacitor
- D. variable resistor Discuss
- 5. In an FM signal, the power
Options- A. increases as the modulation index increases
- B. reduces as the modulation index increase
- C. increases as the modulation index decreases
- D. remains constant when the modulation index increases Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. Which curve represents the fidelity curve of a standard receiver?
Options- A. Curve A
- B. Curve B
- C. Curve C
- D. Curve D Discuss
- 10. 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
Radio Receivers problems
Search Results
Correct Answer: 16 kbps
Correct Answer: Armstrong oscillator
Correct Answer: power amplifier
Correct Answer: capacitor
Correct Answer: remains constant when the modulation index increases
Correct Answer: all of the above
Correct Answer: inadequate image frequency rejection
Correct Answer: Somewhat worse when the receiving frequency is raised
Correct Answer: Curve C
Correct Answer: 20 kHz
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