Communication Systems

Exercise: Communication Systems

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: C

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

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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: D

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In FM, as bandwidth increases

distortion increases

distortion decreases

distortion remains unaffected

all

Answer: B

No answer description is available. Let's discuss.

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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: D

or P = 1.26 x 10^-16 W.

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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: C

or v = 353 m/s.

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