Electronics and Communication Engineering - Radio Receivers

Exercise :: Radio Receivers - Section 1

41. 

The selectivity of a radio receiver is

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.

Answer: Option A

Explanation:

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42. 

If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver

A. Unsuitability will occur
B. Heterodyne whistles will be heard
C. Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible
D. All of the above

Answer: Option D

Explanation:

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43. 

EM 84 tube is used in radio receivers as

A. audio amplifier
B. RF amplifier
C. full wave rectifier
D. magic eye

Answer: Option D

Explanation:

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44. 

Which of the following statement about receivers is false?

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

Answer: Option D

Explanation:

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45. 

Modulated carrier power in FM

A. increases with modulating signal power
B. decreases with modulating signal power
C. is independent of the modulating signal power
D. none

Answer: Option C

Explanation:

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