# Electronics and Communication Engineering - Communication Systems

1.

A telephone channel requires a bandwidth of about

 A. 1 kHz B. 3 kHz C. 10 kHz D. 50 kHz

Explanation:

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2.

For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

 A. 1 B. 0.8 C. 0.5 D. 0

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3.

As per Shannon-Hartley theorem, a noise less Gaussian channel has

 A. zero capacity B. infinite capacity C. small capacity D. none of the above

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4.

DVD uses

 A. Laser beam for both recording and playback B. Laser beam for recording and video head for playback C. Video head for recording and laser beam for playback D. None of the above

Explanation:

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5.

Fourier analysis indicate that a square wave can be represented as

 A. a fundamental sine wave and odd harmonics B. a fundamental sine wave and even harmonics C. a fundamental sine wave and harmonics D. fundamental and subharmonic sine waves