Electrical measurements-Digital Communications MCQs set/2 Sample Test,Sample questions

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Question: 
Advantages of digital communication are

1.Easy multiplexing

2.Easy processing

3.Reliable

4.All of the mentioned

Question: 
Analog to digital conversion includes

1.Sampling

2.Quantization

3.Sampling & Quantization

4.None of the mentioned

Question: 
As the order of the filter increases, the cost ______ and complexity ______

1.Increases, increases

2.Increases, decreases

3. Decreases, increases

4.Decreases, decreases

Question: 
Capacity of a channel can be increased by

1.Increasing channel bandwidth

2.Increasing signal power

3.Increasing channel bandwidth &signal power

4.None of the mentioned

Question: 
Capacity of the channel can be increased by reducing in band noise power.

1.True

2.False

Question: 
Digital communication is _______ to environmental changes?

1.Less sensitive

2.More sensitive

3.Does not depend

4.None of the mentioned

Question: 
Digital communication system can handle

1.Analog signals

2. 1D signals

3.2D signals

4.All of the mentioned

Question: 
Digital system includes

1.Better encryption algorithm

2.Difficult data multiplexing

3.All of the mentioned

4.None of the mentioned

Question: 
Eigen functions are not orthogonal.

1.True

2.False

Question: 
Examples of digital communication are

1.ISDN

2.Modems

3.Classical telephony

4.All of the mentioned

Question: 
Find the 32-ary waveform for the word ‘HAPPY’.

1.280856

2.658082

3.288056

4.None of the mentioned

Question: 
Find the 8-ary waveform for the word ‘HAPPY’.

1.4040020246

2.0440020246

3. 6420200440

4.None of the mentioned

Question: 
Flicker noise is called as

1.White noise

2.Pink noise

3.Brown noise

4.None of the mentioned

Question: 
Matched filter can also be used as least squares estimator.

1.True

2.False

Question: 
Matched filter is

1.Linear

2.Non linear

3.Linear & Non linear

4.None of the mentioned

Question: 
Matched filter technique is used to

1.Increase SNR

2.Decrease SNR

3. SNR is not affected

4.None of the mentioned

Question: 
Matched filtering operation includes

1.Spectral phase matching

2.Spectral amplitude matching

3.Spectral phase & amplitude matching

4.None of the mentioned

Question: 
Shot noise is avoidable when current is

1.Zero

2.One

3.Infinity

4.None of the mentioned

Question: 
Shot noise is produced by

1.Electrons

2.Photons

3.Electrons & Photons

4.None of the mentioned

Question: 
SQNR can be improved by _______ sampling rate.

1.Increasing

2.Decreasing

3.Does not depend

4.None of the mentioned

Question: 
Synchronization available in digital communication are

1.Symbol synchronization

2.Frame synchronization

3.Carrier synchronization

4.All of the mentioned

Question: 
The attenuation level in bounded power spectral density is

1.35

2.50

3.35 & 50

4.none of the mentioned

Question: 
The basic transmission-reception system is a ______ system.

1.Two block system

2.Three block system

3.Four block system

4.None of the mentioned

Question: 
The equivalent temperature in a receiver design must be kept

1.Low

2.High

3.Does not affect the receiver

4.None of the mentioned

Question: 
The information source of a digital communication system can be

1.Packetized

2.Continuous

3.Packetized & Continuous

4.None of the mentioned

Question: 
The interval of frequencies outside which the spectrum is zero is called as ________

1.null to null bandwidth

2.normalized bandwidth

3.absolute bandwidth

4.none of the mentioned

Question: 
The maximum likelihood function is

1.Positive

2.Negative

3.Any of the mentioned

4.None of the mentioned

Question: 
The measure of the width of the main lobe is called as ________

1.Null to null bandwidth

2.Half power bandwidth

3.Normalized bandwidth

4.Absolute bandwidth

Question: 
The point at which the output signal power has fallen to 0.707 of its peak value is called as _____

1.3db point

2.Half power point

3.3db & Half power point

4.None of the mentioned

Question: 
The ratio of the filter bandwidth at -60db and -6db amplitude response point is called as _____

1.Half point factor

2.Normalized factor

3.Shape factor

4.None of the mentioned

Question: 
Thermal noise is a wide sense stationary process.

1.True

2.False

Question: 
Transmission media used for medium frequency band are

1.Coaxial cable

2.Copper cable

3.Optical fiber

4.All of the mentioned

Question: 
Transmission media used in low frequency band are

1.Air

2.Water

3.Copper cable

4.All of the mentioned

Question: 
Two functions are called as orthogonal if on integrating the product we get

1.One

2.Zero

3.Infinity

4. None of the mentioned

Question: 
What are the characteristics of an ideal transmission line?

1.Different amplitude

2.No distortion

3.Time delay

4.All of the mentioned

Question: 
What are the disadvantages of digital communication?

1.Needs more bandwidth

2.Is more complex

3.Needs more bandwidth & Is more complex

4.None of the mentioned

Question: 
What are the main features of a receiver?

1.Synchronization

2.Multiple parallel receiver chain

3.Synchronization & Multiple parallel receiver chain

4.None of the mentioned

Question: 
What are the main features of a transmitter?

1.Higher clock speed

2.Linear power amplifier

3.Directional antennas

4.All of the mentioned

Question: 
What conditions must be fulfilled in a good digital communication system?

1.High data rate

2. High fidelity

3.Low transmit power

4.All of the mentioned

Question: 
What is necessary for digital communication?

1.Precision timing

2.Frame synchronization

3.Character synchronization

4.All of the mentioned

Question: 
Which are the common transmission media used in digital communication system?

1.Coaxial cable

2.Twisted copper cable

3.Radio frequency bands

4.All of the mentioned

Question: 
Which consists of less ISI?

1.Nyquist filter

2.Raised cosine filter

3.Nyquist & Raised cosine filter

4.None of the mentioned

Question: 
Which corrects the sampling time problem in a digital system?

1.Interpolator

2.Decimator

3.Equalizer

4.Filter

Question: 
Which filter has maximum flatness?

1.Chebyshev filter

2.Butter-worth filter

3.High pass filter

4.Normalized filter

Question: 
Which has the same power spectral density?

1.White noise

2.Brown noise

3.White & Brown noise

4.None of the mentioned

Question: 
Which noise is useful for dithering?

1.White noise

2.Pink noise

3.Brown noise

4.None of the mentioned

Question: 
Which occurs due to equilibrium fluctuations?

1.Thermal noise

2.Johnson noise

3.Thermal & Johnson noise

4.None of the mentioned

Question: 
Which offers better SQNR?

1.Delta modulation

2.PCM

3.Delta modulation & PCM

4.None of the mentioned

Question: 
Which system uses digital transmission?

1.ISDN

2.LANs

3.ISDN & LANs

4.None of the mentioned

Question: 
Wired channels are

1.Lossy

2.Lossless

3.Lossy & Lossless

4.None of the mentioned

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