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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 8
41.
If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about
330 m/s
334 m/s
353 m/s
380 m/s
Answer: Option
Explanation:

or v = 353 m/s.

42.
A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is
1.26 x 106 W
1.26 x 10-2 W
1.26 x 10-8 W
1.26 x 10-16 W
Answer: Option
Explanation:

or P = 1.26 x 10-16 W.

43.
In FM, as bandwidth increases
distortion increases
distortion decreases
distortion remains unaffected
all
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is
400 W
512 W
112 W
56 W
Answer: Option
Explanation:

.

45.
In TV transmitter, the function of duplexer is
to amplify video signal
to remove distortions in audio signal
to combine outputs of visual and audio transmitters
to amplify audio signal
Answer: Option
Explanation:

Duplexer combines video and audio signals so that they can be sent out by a common antenna.

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