Electrical measurements/Digital Communications MCQs set-4 Sample Test,Sample questions

Question:
 Phase encoded group consists of

1.Manchester coding

2.Bi-phase-mark

3. Miller coding

4.All of the mentioned


Question:
Adaptive DPCM is used to

1.Increase bandwidth

2.Decrease bandwidth

3.Increase SNR

4.None of the mentioned


Question:
Application of phase encoded binary signals are

1.Optical communication

2.Magnetic recording

3.Satellite telemetry

4.All of the mentioned


Question:
Choosing a discrete value that is near but not exactly at the analog signal level leads to

1.PCM error

2.Quantization error

3.PAM error

4.Sampling error


Question:
Companding is the process of

1.Compression

2.Expansion

3.Compression & Expansion

4.None of the mentioned


Question:
Delta modulation uses _____ bits per sample.

1.One

2.Two

3.Four

4.Eight


Question:
DPCM encodes the PCM values based on

1.Quantization level

2.Difference between the current and predicted value

3.Interval between levels

4.None of the mentioned


Question:
Examples of PCM waveforms are

1.Non return to zero

2.Phase encoded

3.Multilevel binary

4.All of the mentioned


Question:
In non uniform quantization, the quantization noise is _______ to signal size.

1.Inversely proportional

2.Directly proportional

3.Equal

4.Double


Question:
In PCM encoding, quantization level varies as a function of ________

1.Frequency

2.Amplitude

3.Square of frequency

4. Square of amplitude


Question:
In PCM the samples are dependent on ________

1.Time

2.Frequency

3.Quanization leavel

4.Interval between quantization level


Question:
In pulse modulation, reciprocal of T(time) is

1.Bandwidth

2.Symbol rate

3.Signal voltage

4.None of the mentioned


Question:
In quantization process, the amount of quantization noise is _______________ to number of levels.

1.Directly proportional

2.Inversely proportional

3.Independent

4.None of the mentioned


Question:
In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?

1.Unipolar RZ

2.Bipolar RZ

3.RZ-AMI

4.Manchester coding


Question:
In which waveform logic 1 is represented by equal amplitude alternating pulses?

1.Unipolar RZ

2.Bipolar RZ

3.RZ-AMI

4.Manchester coding


Question:
In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?

1.Unipolar RZ

2.Bipolar RZ

3.RZ-AMI

4.Manchester coding


Question:
In which waveform one is represented by half bit wide pulse positioned during the first half and zero is represented by half bit wide pulse positioned in the second half?

1.Bi-p-L

2.Bi-p-M

3.Bi-p-S

4.Delay modulation


Question:
Non uniform quantization provides better quantization for

1.Weak signals

2.Coarse signals

3.Weak & Coarse signals

4.None of the mentioned


Question:
NRZ-S is complement of _______

1.NRZ-L

2.NRZ-M

3.NRZ-L & NRZ-M

4.None of the mentioned


Question:
Quantization noise can be reduced by ________ the number of levels.

1.Decreasing

2.Increasing

3.Doubling

4.Squaring


Question:
Sample resolution for LPCM ____ bits per sample.

1.8

2.16

3.24

4. All of the mentioned


Question:
Saturation noises can be avoided or reduced by

1.Automatic gain control

2.Amplifying

3.Filtering

4.None of the mentioned


Question:
Signal to noise ratio increases as ___________ increases.

1.Quantization level

2.Square of quantization level

3.Square root of quantization level

4.None of the mentioned


Question:
Signal to noise ratio is infinite when

1.Quantization noise is zero

2.Number of levels are infinite

3.Quantization noise is zero & Number of levels are infinite

4.None of the mentioned


Question:
The distortion in quantization is called as

1.Round off error

2.Truncation error

3.Round off & Truncation error

4.None of the mentioned


Question:
The length of the code-word obtained by encoding quantized sample is equal to

1.l=log(to the base 2)L

2.l=log(to the base 10)L

3.l=2log(to the base 2)L

4.l=log(to the base 2)L/2


Question:
The main sources of corruption are

1.Sampling and quantizing effects

2.Channel effects

3.Sampling, quantizing and channel effects

4.None of the mentioned


Question:
The output SNR can be made independent of input signal level by using

1.Uniform quantizer

2.Non uniform quantizer

3.Uniform & Non uniform quantizer

4.None of the mentioned


Question:
The reasons for the threshold effect are

1.Thermal noise

2.Interference from other users

3.Interference from circuit switching transients

4.All of the mentioned


Question:
The return to zero waveform consists of

1.Unipolar RZ

2.Bipolar RZ

3.RZ-AMI

4.All of the mentioned


Question:
The size of the quantile interval is called as

1.Inter level

2.Step size

3.Quantile size

4.Level width


Question:
The standard value of A in A-law is

1.87

2.88

3.86.7

4.87.6


Question:
The _____________ corresponds to average quantization noise power.

1.Mean

2.Variance

3.Probability density function

4.None of the mentioned


Question:
Timing jitter can be reduced by

1.Good power supply isolation

2.Stable clock reference

3.Good power supply isolation & Stable clock reference

4.None of the mentioned


Question:
Uniform quantization provides better quantization for

1.Weak signals

2.Strong signals

3.Weak & Strong signals

4.None of the mentioned


Question:
What is bit depth?

1.Number of quantization level

2.Interval between two quantization levels

3.Number of possible digital values to represent each sample

4.None of the mentioned


Question:
What is the standard value of μ in μ-law ?

1.128

2. 255

3. 256

4.0


Question:
When channel bandwidth is greater than the pulse bandwidth, it causes

1.Intersignal interference

2.Intersymbol interference

3.Bandwidth error

4.None of the mentioned


Question:
When pulse code modulation is applied to non binary symbols we obtain waveform called as

1.PCM

2.PAM

3.M-ary

4.line codes


Question:
Which binary waveform uses three levels?

1.Bipolar RZ

2.RZ-AMI

3. Bipolar RZ & RZ-AMI

4.None of the mentioned


Question:
Which method is called as differential encoding?

1.NRZ-L

2.NRZ-M

3.NRZ-S

4.None of the mentioned


Question:
Which method is preferred in magnetic tape recording?

1.NRZ-L

2.NRZ-M

3.NRZ-S

4.None of the mentioned


Question:
Which type is used and preferred in digital logic circuits?

1.NRZ-L

2.NRZ-M

3.NRZ-S

4.None of the mentioned


Question:
Which type of quantization is most preferable for audio signals for a human ear?

1.Uniform quantization

2.Non uniform quantization

3.Uniform & Non uniform quantization

4.None of the mentioned


Question:
Which value of μ corresponds to linear amplification?

1.μ=0

2.μ=1

3.μ>0

4.μ<0


Question:
Which waveform has the feature of error detection?

1.NRZ-L

2.RZ-AMI

3.Manchester coding

4.Duobinary


Question:
Which waveform scheme introduces bandwidth compression?

1.Duobinary

2.Manchester coding

3.Phase encoded waveform

4.Multilevel codes


Question:
Which waveform type has better noise immunity?

1.NRZ

2.RZ

3.Phase encoded

4.Multilevel codes


Question:
Which waveform type has the feature of clocking?

1.Manchester coding

2.Bbi-p-M

3.Delay modulation

4.NRZ-L


Question:
Which waveforms are also called as line codes?

1.PCM

2. PAM

3.FM

4.AM


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