Discussion
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- Question
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
- Correct Answer
- remains constant when the modulation index increases
- 1. The IF stage of a receiver employs
Options- A. capacitive coupling
- B. impedance coupling
- C. double-tuned transformer coupling
- D. single-tuned transformer coupling Discuss
- 2. In a receiver, at higher frequencies
Options- A. tracking will be improved
- B. tracking will be poor
- C. selectivity will be poor
- D. image frequency rejection will be poor Discuss
- 3. In a radio receiver
Options- A. the local oscillator frequency is made higher than the incoming signal frequency
- B. the local oscillator frequency is made lower than the incoming signal frequency
- C. the local oscillator frequency is made equal to the incoming signal frequency Discuss
- 4. The image frequency of a superheterodyne receiver is
Options- A. independent of the frequency at which the receiver is tuned
- B. always outside the operating range of the receiver
- C. typical to FM receivers only
- D. not rejected by the IF tuned circuits Discuss
- 5. Which of the following noise becomes of great importance at high frequencies?
Options- A. Transit-time noise
- B. Shot noise
- C. Flicker noise
- D. Agitation noise Discuss
- 6. A trimmer is basically a
Options- A. insulator
- B. inductor
- C. capacitor
- D. variable resistor Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Radio Receivers problems
Search Results
Correct Answer: double-tuned transformer coupling
Correct Answer: tracking will be improved
Correct Answer: the local oscillator frequency is made higher than the incoming signal frequency
Correct Answer: typical to FM receivers only
Correct Answer: Transit-time noise
Correct Answer: capacitor
Correct Answer: power amplifier
Correct Answer: Armstrong oscillator
Correct Answer: 16 kbps
Correct Answer: AM-DSB signal with carrier
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