180+ Digital Communication Solved MCQs

The process of converting the analog sample into discrete form is called

The characteristics of compressor in μ-law companding are

The modulation techniques used to convert analog signal into digital signal are

The sequence of operations in which PCM is done is

In PCM, the parameter varied in accordance with the amplitude of the modulating signal is

One of the disadvantages of PCM is

The expression for bandwidth BW of a PCM system, where v is the number of bits per sample and fm is the modulating frequency, is given by

The error probability of a PCM is

In Delta modulation,

In digital transmission, the modulation technique that requires minimum bandwidth is

In Delta Modulation, the bit rate is

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

DPCM suffers from

The noise that affects PCM

The factors that cause quantizing error in delta modulation are

Granular noise occurs when

The crest factor of a waveform is given as –

The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

The digital modulation scheme in which the step size is not fixed is

In Adaptive Delta Modulation, the slope error reduces and

The number of voice channels that can be accommodated for transmission in T1 carrier system is

The maximum data transmission rate in T1 carrier system is

T1 carrier system is used

Matched filter may be optimally used only for

Matched filters may be used

The process of coding multiplexer output into electrical pulses or waveforms for transmission is called

For a line code, the transmission bandwidth must be

Regenerative repeaters are used for

Scrambling of data is

In polar RZ format for coding, symbol ‘0’ is represented by

Polar coding is a technique in which

The polarities in NRZ format use

The format in which the positive half interval pulse is followed by a negative half interval pulse for transmission of ‘1’ is

The maximum synchronizing capability in coding techniques is present in

The advantage of using Manchester format of coding is

Alternate Mark Inversion (AMI) is also known as

In DPSK technique, the technique used to encode bits is

Overhead bits are

ISI may be removed by using

Timing jitter is

Probability density function defines

Impulse noise is caused due to

In coherent detection of signals,

Synchronization of signals is done using

Orthogonality of two codes means

In Alternate Mark Inversion (AMI) is

Advantages of using AMI

The interference caused by the adjacent pulses in digital transmission is called

Eye pattern is

The time interval over which the received signal may be sampled without error may be explained by

For a noise to be white Gaussian noise, the optimum filter is known as

Matched filters are used

The number of bits of data transmitted per second is called

Pulse shaping is done

The criterion used for pulse shaping to avoid ISI is

The filter used for pulse shaping is

Roll – off factor is defined as

Nyquist criterion helps in

The Nyquist theorem is

The difficulty in achieving the Nyquist criterion for system design is

Equalization in digital communication

Zero forced equalizers are used for

The transmission bandwidth of the raised cosine spectrum is given by

The preferred orthogonalization process for its numerical stability is

For two vectors to be orthonormal, the vectors are also said to be orthogonal. The reverse of the same

Orthonormal set is a set of all vectors that are

In On-Off keying, the carrier signal is transmitted with signal value ‘1’ and ‘0’ indicates

ASK modulated signal has the bandwidth

Coherent detection of binary ASK signal requires

The probability of error of DPSK is ______________ than that of BPSK.

In Binary Phase Shift Keying system, the binary symbols 1 and 0 are represented by carrier with phase shift of

BPSK system modulates at the rate of

The BPSK signal has +V volts and -V volts respectively to represent

The binary waveform used to generate BPSK signal is encoded in

The bandwidth of BFSK is ______________ than BPSK.

In Binary FSK, mark and space respectively represent

The frequency shifts in the BFSK usually lies in the range

The spectrum of BFSK may be viewed as the sum of

The maximum bandwidth is occupied by

QPSK is a modulation scheme where each symbol consists of

The data rate of QPSK is ___________ of BPSK.

QPSK system uses a phase shift of

Minimum shift keying is similar to

In MSK, the difference between the higher and lower frequency is

The technique that may be used to reduce the side band power is

Analog to digital conversion includes

The process of converting the analog sample into discrete form is called

The modulation techniques used to convert analog signal into digital signal are

In Delta modulation,

In digital transmission, the modulation technique that requires minimum bandwidth is

In Delta Modulation, the bit rate is

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

The crest factor of a waveform is given as –

The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

Impulse sampling is also called as

Nyquist Rate is given by

The number of voice channels that can be accommodated for transmission in T1 carrier system is

For a line code, the transmission bandwidth must be

Scrambling of data is

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