Electronics and Communication Engineering - Radio Receivers

Exercise :: Radio Receivers - Section 1

21. 

A transmitter serial current contains

A. carrier frequencies
B. audio frequencies
C. radio frequencies
D. none of the above

Answer: Option C

Explanation:

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22. 

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. The image frequency at 25 MHz will be

A. 24.09 MHz
B. 24.54 MHz
C. 25.45 MHz
D. 25.91 MHz

Answer: Option D

Explanation:

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23. 

In a communication system, noise is most likely to affect the signal

A. at the transmitter
B. in the channel
C. in the information source
D. at the destination

Answer: Option B

Explanation:

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24. 

The noise produced by a resistor is proportional to

A. absolute temperature
B. (absolute temperature)2
C.
D.

Answer: Option A

Explanation:

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25. 

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

A. Selectivity will be poor
B. Tracking difficulties will be least
C. Adjacent channel rejection will improve
D. All of the above will occur

Answer: Option A

Explanation:

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