Electronics and Communication Engineering - Radio Receivers

Exercise :: Radio Receivers - Section 1

31. 

In a radio receiver, if the intermediate frequency is too low

A. Image-frequency rejection will improve
B. Selectivity will be too sharp
C. The frequency selectivity of the local oscillator will have to be lowered
D. All of the above

Answer: Option B

Explanation:

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32. 

FM amplifier in a superheterodyne receiver

A. increases selectivity
B. suppresses noise
C. provides improved tracking
D. improves the rejection of the image frequency

Answer: Option D

Explanation:

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33. 

Padders are used in a receiver to

A. discard the carrier
B. facilitate tracking
C. filter the input signal
D. suppress noise

Answer: Option B

Explanation:

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34. 

In a radio receiver, the local oscillator is tuned to a frequency

A. lower than the incoming frequency
B. higher than the incoming frequency
C. equal to incoming frequency
D. any of the above

Answer: Option B

Explanation:

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35. 

Which of the following oscillator is generally not used at VHF?

A. Colpitts oscillator
B. Clapp oscillator
C. Armstrong oscillator
D. Ultra Audio oscillator

Answer: Option C

Explanation:

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