Digital Communication Mcqs

Q:

Thermal noise power of a resistor depends upon

A) Its resistance value B) Noise temperature
C) Bandwidth D) Ambient temperature
 
Answer & Explanation Answer: B) Noise temperature

Explanation: Thermal noise power of a resistor depends upon noise temperature.

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15
Q:

The type of noise that interferes much with high frequency transmission is

A) White B) Flicker
C) Transit time D) Shot
 
Answer & Explanation Answer: C) Transit time

Explanation: The type of noise that interferes much with high frequency transmission is transit time.

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17
Q:

The probability density function of the envelope of narrow band noise is

A) Uniform B) Gaussian
C) Rayleigh D) Rician
 
Answer & Explanation Answer: B) Gaussian

Explanation: The probability density function of the envelope of narrow band noise is Gaussian function.

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12
Q:

The spectral density of white noise is

A) Exponential B) Uniform
C) Poisson D) Gaussian
 
Answer & Explanation Answer: B) Uniform

Explanation: The spectral density of white noise is uniform.

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9
Q:

Vector quantization is used in

A) Audio coding B) Video coding
C) Speech coding D) All of the mentioned
 
Answer & Explanation Answer: C) Speech coding

Explanation: Vector quantization is widely used in speech coding for digital cellular systems.

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11
Q:

Non uniform quantizer ______ distortion.

A) Increases B) Decreases
C) Does not effect D) None of the mentioned
 
Answer & Explanation Answer: B) Decreases

Explanation: Distortion can be reduced by using non uniform quantizer.

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9
Q:

The theoretical gain in zero crossing TED is greater than early late TED.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: The theoretical gain in zero crossing timing error detection is twice more than that in the early late timing error detection method.

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9
Q:

In early late timing error detection method if the bit is constant, then the slope will be

A) Close to zero B) Close to infinity
C) Close to origin D) None of the mentioned
 
Answer & Explanation Answer: A) Close to zero

Explanation: In early timing error detection method if the bit is constant and doesn’t change, then the slope will be close to zero.

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