### questions

Title
###### In uniform quantization process

In uniform quantization process

1. the step size remains same
2. step size varies according to the values of the input signal
3. the quantizer has linear characteristics
4. both a and c are correct
###### The process of converting the analog sample into discrete form is called

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

1. modulation
2. multiplexing
3. quantization
4. sampling
###### The characteristics of compressor in μ-law companding are

The characteristics of compressor in μ-law companding are

1. continuous in nature
2. logarithmic in nature
3. linear in nature
4. discrete in nature
###### The modulation techniques used to convert analog signal into digitalsignal are

The modulation techniques used to convert analog signal into digitalsignal are

1. pulse code modulation
2. delta modulation
4. all of the above
###### The sequence of operations in which PCM is done is

The sequence of operations in which PCM is done is

1. sampling, quantizing, encoding
2. quantizing, encoding, sampling
3. quantizing, sampling, encoding
4. none of the above
###### In PCM, the parameter varied in accordance with the amplitude of themodulating signal is

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

1. amplitude
2. frequency
3. phase
4. none of the above
###### One of the disadvantages of PCM is

One of the disadvantages of PCM isa

1. it requires large bandwidth
2. very high noise
3. cannot be decoded easily
###### The expression for bandwidth BW of a PCM system, where v is thenumber of bits per sample and fm is the modulating frequency, is given by

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

1. bw ≥ vfm
2. bw ≤ vfm
3. bw ≥ 2 vfm
4. bw ≥ 1/2 vfm
###### The error probability of a PCM is

The error probability of a PCM is

1. calculated using noise and inter symbol interference
2. gaussian noise + error component due to inter symbol interference
3. calculated using power spectral density
4. all of the above
###### In Delta modulation,

In Delta modulation,

1. one bit per sample is transmitted
2. all the coded bits used for sampling are transmitted
3. the step size is fixed
4. both a and c are correct
###### In digital transmission, the modulation technique that requiresminimum bandwidth is

In digital transmission, the modulation technique that requiresminimum bandwidth is

1. delta modulation
2. pcm
3. dpcm
4. pam
###### n Delta Modulation, the bit rate is

n Delta Modulation, the bit rate is

1. n times the sampling frequency
2. n times the modulating frequency
3. n times the nyquist criteria
4. none of the above
###### In Differential Pulse Code Modulation techniques, the decoding isperformed by

In Differential Pulse Code Modulation techniques, the decoding isperformed by

1. accumulator
2. sampler
3. pll
4. quantizer
###### DPCM suffers from

DPCM suffers from

2. quantization noise
3. both a & b
4. none of the above
###### The noise that affects PCM

The noise that affects PCM

1. transmission noise
2. quantizing noise
3. transit noise
4. both a and b are correct
###### The factors that cause quantizing error in delta modulation are

The factors that cause quantizing error in delta modulation are

2. granular noise
3. white noise
4. both a and b are correct
###### Granular noise occurs when

Granular noise occurs when

1. step size is too small
2. step size is too large
3. there is interference from the adjacent channel
4. bandwidth is too large
###### The crest factor of a waveform is given as –

The crest factor of a waveform is given as –

1. 2peak value/ rms value
2. rms value / peak value
3. peak value/ rms value
4. peak value/ 2rms value
###### The digital modulation technique in which the step size is variedaccording to the variation in the slope of the input is called

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

1. delta modulation
2. pcm
4. pam
###### The digital modulation scheme in which the step size is not fixed is

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

1. delta modulation
3. dpcm
4. pcm
###### total MCQs: 182 MCQs

##### 182 Views

##### 476  