White noise has _______ power spectral density.

1.Constant

2.Variable

3.Constant & Variable

4.None of the mentioned

A nyquist pulse is the one which can be represented by _____ shaped pulse multiplied by another time function.

1.Sine

2.Cosine

3.Sinc

4.None of the mentioned

A to D conversion process uses

1.Sampler

2.Quantizer

3.Sampler & Quantizer

4.None of the mentioned

Auto-correlation function is a

1.Even function

2.Odd function

3. Even & Odd function

4.None of the mentioned

Channels display multi-path due to

1.Scattering

2.Time delayed reflections

3.Diffraction

4.All of the mentioned

Decreasing the data rate is called as

1.Aliasing

2.Down sampling

3.Up sampling

4.None of the mentioned

Delay element in delta modulation acts as

1.First order predictor

2.Second order predictor

3. Third order predictor

4.Fourth order predictor

Different cases of sampling include

1.Ideal impulse sampling

2.Flat-topped sampling

3.Sampling with rectangular pulses

4.All of the mentioned

For both PPM and PDM _______ is kept constant.

1.Amplitude

2.Time period

3.Frequency

4.Number of levels

From digital filter we will get the output pulse as the _______ of the current and the previous pulse.

1.Summation

2.Difference

3.Product

4.Ratio

If each pulse of the sequence to be detected is in _____ shape, the pulse can be detected without ISI.

1.Sine

2.Cosine

3.Sinc

4.None of the mentioned

In duobinary signalling method, for M-ary transmission, the number of output obtained is

1.2M

2.2M+1

3.2M-1

4.M2

In M-ary PPM waveform, modulation is effected by

1.Delaying

2.Advancing

3.Delaying & Advancing

4.None of the mentioned

In polybinary signalling method the present bit of binary sequence is algebraically added with ______ number of previous bits.

1.j

2.2j

3.j+2

4. j-2

In precoding technique, the binary sequence is _____ with the previous precoded bit.

1.And-ed

2.Or-ed

3. EXOR-ed

4.Added

In which mixing is easier?

1.Analog signal

2.Digital signal

3.Analog & Digital signal

4.None of the mentioned

Non uniform quantization includes

1.Compression

2.Expansion

3.Compression & Expansion

4.None of the mentioned

Original signal came to be retraced from sampled version using

1.Low pass filtering

2.High pass filtering

3.Low & High pass filtering

4.None of the mentioned

Reconstruction filter is difficult to implement in hardware.

1.True

2.False

Shot noise occurs in

1.Transistors

2.Valves

3.Transistors & Valves

4.None of the mentioned

Some of the M-ary waveforms are

1.PAM

2.PPM

3.PDM

4.All of the mentioned

Source coding reduces

1.Redundancy

2.Average bit rate

3.Redundancy & Average bit rate

4.None of the mentioned

Source encoding procedure does

1.Sampling

2.Quantization

3.Compression

4.All of the mentioned

The average noise power of white noise is

1.0

2.Infinity

3.1

4.None of the mentioned

The causes for error performance degradation in communication systems are

1.Interference

2.Electrical noise

3.Effect of filtering

4.All of the mentioned

The channel may be affected by

1.Thermal noise

2.Interference from other signals

3.Thermal noise & Interference from other signals

4.None of the mentioned

The composite equalizing filter is the combination of

1.Receiving and equalizing filter

2.Transmitting and equalizing filter

3.Amplifier and equalizing filter

4. None of the mentioned

The duobinary filter, He (f) is called as

1.Sine filter

2.Cosine filter

3.Raised cosine filter

4.None of the mentioned

The filter which is used to recover the pulse with less ISI is called as

1.Matched filter

2.Correlator

3.Matched filter & Correlator

4.None of the mentioned

The method in which small amount of controlled ISI is introduced into the data stream rather than trying to eliminate it completely is called as

1.Correlative coding

2.Duobinary signalling

3.Partial response signalling

4.All of the mentioned

The method in which the tail of one pulse smears into adjacent symbol interval is called as

1.Intersymbol interference

2.Interbit interference

3.Interchannel interference

4.None of the mentioned

The method using which the error propagation in dubinary signalling can be avoided is

1.Filtering

2.Precoding

3.Postcoding

4.None of the mentioned

The method which has greater bandwidth efficiency is called as

1.Duobinary signalling

2.Polybinary signalling

3.Correlative coding

4.All of the mentioned

The primary advantage of this method is

1.redistribution of spectral density

2.to favor low frequencies

3.redistribution of spectral density & to favor low frequencies

4.none of the mentioned

The quantization will be finer when

1.Smaller the number of discrete amplitudes

2.Larger the number of discrete amplitudes

3.Does not depend on amplitudes

4.None of the mentioned

The sample from the demodulation process consists of sample which is _______ to energy of the received symbol and _____ to noise.

1.Directly and inversely proportional

2.Inversely and directly proportional

3.Both directly proportional

4.Both inversely proportional

The signal can be reconstructed

1.At Nyquist rate

2.Above Nyquist rate

3.At & above the Nyquist rate

4.None of the mentioned

The term heterodyning refers to

1.Frequency conversion

2.Frequency mixing

3.Frequency conversion & mixing

4.None of the mentioned

Thermal noise in the communication system due to thermal electrons

1.Can be eliminated

2.Cannot be eliminated

3.Can be avoided upto some extent

4.None of the mentioned

To avoid aliasing

1.Reduce the bandwidth

2.Cut out high frequency

3.Reduce the bandwidth & Cut out high frequency

4.None of the mentioned

Transmitted pulse becomes distorted due to

1.Ideal transmission characteristic

2.Non ideal transmission characteristic

3.All of the mentioned

4.None of the mentioned

Using ARMA filter

1.Sampling can be done in real time

2.Gives sharp output

3.All of the mentioned

4.None of the mentioned

What is symbol rate packing?

1.Maximum possible symbol transmission rate

2.Maximum possible symbol receiving rate

3.Maximum bandwidth

4.Maximum ISI value allowed

Which are called as hard decisions?

1.Estimates of message symbol with error correcting codes

2.Estimates of message symbol without error correcting codes

3.All of the mentioned

4.None of the mentioned

Which device is needed for the reconstruction of signal?

1.Low pass filter

2.Equalizer

3.Low pass filter & Equalizer

4.None of the mentioned

Which filter does not have sharp output?

1.Linear phase filter

2.Delayed symmetric filter

3.Linear phase & Delayed symmetric filter

4.None of the mentioned

Which method should be implemented for reducing bandwidth?

1.Multilevel codes

2. Multilevel signalling

3.PAM

4.PDM

Which process requires low pass filter?

1.Up-sampling

2.Down-sampling

3.Up-sampling & Down-sampling

4.None of the mentioned

Which requires interpolation filtering?

1.Up-sampler

2. D to A converter

3.Up-sampler & D to A converter

4.None of the mentioned

Which signals are function of time?

1.Random signal

2.Deterministic signal

3.Random & Deterministic signal

4.None of the mentioned

- Electrical Measurement MCQ Question Set 1
- Electrical Measurement MCQ Question Set 2
- Electrical Measurement MCQ Question Set 3
- Electrical Measurement MCQ Question Set 4
- Electrical Measurement MCQ Question Set 5
- Electrical Measurement MCQ Question Set 6
- Electrical Measurement MCQ Question Set 7
- Electrical Measurement MCQ Question Set 8
- Electrical Measurement MCQ Question Set 9
- Electrical Measurement MCQ Question Set 10
- Electrical Measurement MCQ Question Set 11
- Electrical Measurement MCQ Question Set 12
- Electrical Measurement MCQ Question Set 13
- Electrical Measurement MCQ Question Set 14
- Electrical Measurement MCQ Question Set 15
- Electrical Measurement MCQ Question Set 16
- Electrical Measurement MCQ Question Set 17
- Digital Communications MCQs set-1
- Digital Communications MCQs set-2
- Digital Communications MCQs set-3
- Digital Communications MCQs set-4
- Digital Communications MCQs set-5
- Digital Communications MCQs set-6
- Digital Communications MCQs set-7
- Digital Communications MCQs set-8
- Digital Communications MCQs set-9
- Digital Communications MCQs set-10
- Digital Communications MCQs set-11
- Digital Communications MCQs set-12
- Digital Communications MCQs set-13
- Digital Communications MCQs set-14
- Digital Communications MCQs set-15
- Digital Communications MCQs set-16
- Digital Communications MCQs set-17

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