Digital Communication

This is an MCQ-based quiz on Digital Communication.

This includes Modulation, Multiplexing, Quantization, and Sampling.

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While recovering signal, which gets attenuated more?

Low frequency component High frequency component Low & High frequency component None of the mentioned

Mutual information should be

Positive Negative Positive & Negative None of the mentioned

ASCII code is a

Fixed length code Variable length code Fixed & Variable length code None of the mentioned

Which reduces the size of the data?

Source coding Channel coding Source & Channel coding None of the mentioned

In digital image coding which image must be smaller in size?

Input image Output image Input & Output image None of the mentioned

Which coding method uses entropy coding?

Lossless coding Lossy coding Lossless & Lossy coding None of the mentioned

Which achieves greater compression?

Lossless coding Lossy coding Lossless & Lossy coding None of the mentioned

A code is a mapping from

Binary sequence to dicrete set of symbols Discrete set of symbols to binary sequence All of the mentioned None of the mentioned

Which are uniquely decodable codes?

Fixed length codes Variable length codes Fixed & Variable length codes None of the mentioned

A rate distortion function is a

Concave function Convex function Increasing function None of the mentioned

DPCM suffers from

Slope over load distortion Quantization noise Both a & b None of the above

DPCM is a technique

To convert analog signal into digital signal Where difference between successive samples of the analog signals are encoded into n-bit data streams Where digital codes are the quantized values of the predicted value All of the above

In Differential Pulse Code Modulation techniques, the decoding is performed by

Accumulator Sampler PLL Quantizer

The noise that affects PCM

Transmission noise Quantizing noise Transit noise Both a and b are correct

The factors that cause quantizing error in delta modulation are

Slope overload distortion Granular noise White noise Both a and b are correct

Overhead bits are

Framing and synchronizing bits Data due to noise Encoded bits None of the above

The expected information contained in a message is called

Entropy Efficiency Coded signal None of the above

Timing jitter is

Change in amplitude Change in frequency Deviation in location of the pulses All of the above

Probability density function defines

Amplitudes of random noise Density of signal Probability of error All of the above

Impulse noise is caused due to

Switching transients Lightening strikes Power line load switching All of the above
Quiz/Test Summary
Title: Digital Communication
Questions: 20
Contributed by:
Diego