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- Question
In superheterodyne receivers, the local oscillator is used to
Options- A. detect the modulating signal
- B. amplify the received modulated carrier
- C. shift the frequency of the received modulated carrier to the IF band
- Correct Answer
- shift the frequency of the received modulated carrier to the IF band
- 1. It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude
Options- A. will increase
- B. will decrease
- C. will remain constant
- D. will reduce to negligible value Discuss
- 2. A transmitter serial current contains
Options- A. carrier frequencies
- B. audio frequencies
- C. radio frequencies
- D. none of the above Discuss
- 3. Which of the following noise does not occur in transistors?
Options- A. Partition noise
- B. Shot noise
- C. Flicker noise
- D. Resistance noise Discuss
- 4. In a receiver, which of the following device has IF input but RF output?
Options- A. Demodulator
- B. Loudspeaker
- C. Audio amplifier
- D. Frequency changer Discuss
- 5. In a communication system, noise is most likely to affect the signal
Options- A. at the transmitter
- B. in the channel
- C. in the information source
- D. at the destination Discuss
- 6. In a radio receiver, the local oscillator is tuned to a frequency
Options- A. lower than the incoming frequency
- B. higher than the incoming frequency
- C. equal to incoming frequency
- D. any of the above Discuss
- 7. The selectivity of a radio receiver is
Options- A. its ability to reject adjacent unwanted signals
- B. its ability to amplify weak signals
- C. the frequency at which it gives maximum amplification to signal.
- D. its ability to suppress noise. Discuss
- 8. 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
- 9. 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
- 10. Neutralization is used in RF amplifiers to
Options- A. stop oscillation
- B. increase bandwidth
- C. improve selectivity
- D. all of the above Discuss
Radio Receivers problems
Search Results
Correct Answer: will decrease
Correct Answer: radio frequencies
Correct Answer: Partition noise
Correct Answer: Demodulator
Correct Answer: in the channel
Correct Answer: higher than the incoming frequency
Correct Answer: its ability to reject adjacent unwanted signals
Correct Answer: The circuit is always biased in class C, by virtue of the leak type bias
Correct Answer: Variable sensitivity is used to eliminate selective fading
Correct Answer: stop oscillation
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