15 | Electrical measurements-Digital Communications MCQs set | Learn & Give Online MCQS Test ,MCQs: multiple choice questions and answers,Mock Tests and Practice Papers

Question:

 Scintillation describes the fading caused by

1.Atmospheric changes

2.Physical changes

3.Thermal noise

4.Propagating effects

Question:

A rake receiver uses multiple

1.Delay circuits

2.Correlators

3.Detectors

4.None of the mentioned

Question:

Block fading occurs in

1.Frequency domain

2.Time domain

3.Frequency & Time domain

4.None of the mentioned

Question:

Channelâ€™s time spreading properties are

1.Coherence bandwidth

2.Signal dispersion

3.Coherence bandwidth & Signal dispersion

4.None of the mentioned

Question:

Coherence time is _______ to Doppler spread.

1.Directly proportional

2.Inversely proportional

3.Not dependent

4.None of the mentioned

Question:

Diversity technique is applied at

1.Base station

2.Mobile receiver

3.Base station & Mobile receiver

4.None of the mentioned

Question:

Diversity technique is used for combating

1.Fading

2.Error bursts

3.Co-channel interference

4.All of the mentioned

Question:

DSA protocol is based on

1.Discrete logarithm problem

2.Continuous logarithm problem

3.Discrete & Continuous logarithm problem

4.None of the mentioned

Question:

Fading channel has memory.

1.True

2.False

Question:

Fast fading can be minimized by

1.Robust modulation

2.Coding and interleaving

3.Robust modulation, Coding and interleaving

4.None of the mentioned

Question:

Flat fading can be avoided or stopped by

1.Error coding

2.Equalization

3.Adaptive bit loading

4.All of the mentioned

Question:

Frequency tracking loop can minimize irreducible error rate by using

1.GMSK

2.DMSK

3.MSK

4.QAM

Question:

How can frequency selective distortion be minimized?

1.By using pilot signal

2.By adaptive equalization

3.By spread spectrum

4. All of the mentioned

Question:

How can slow fading be minimized?

1.By diversity technique

2.Error correcting codes

3.By diversity technique & Error correcting codes

4.None of the mentioned

Question:

If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.

1.Flat

2.Frequency selective

3.Fast fading

4.Time selective

Question:

If delay time is greater than symbol time, _______ fading occurs.

1.Frequency selective

2.Time selective

3.Frequency non selective

4.None of the mentioned

Question:

If delay time is lesser than symbol time, ______ fading occurs.

1.Frequency non selective

2.Flat

3.Frequency non selective & Flat

4.None of the mentioned

Question:

If signalling rate is less than fading rate, _____ fading occurs.

1.Slow

2.Fast

3.Time selective

4. None of the mentioned

Question:

In hash function output length is fixed.

1.True

2.False

Question:

Information reliability depends on

1.Magnitude of each component

2.Time of arrival of each component

3.Magnitude & Time of arrival of each component

4.None of the mentioned

Question:

Interleaving does

1.Forward error correction

2.Backward error correction

3.Forward & Backward error correction

4.None of the mentioned

Question:

Large scale fading refers the attenuation in

1.Amplitude

2.Phase

3.Signal power

4.None of the mentioned

Question:

Minimum time required for magnitude change or phase change is called as

1.Shift time

2.Coherence time

3.Delay time

4.None of the mentioned

Question:

Multiple isolated peaks in multipath components is called as

1.Fingers

2.Returns

3.Fingers & Returns

4.None of the mentioned

Question:

Rake receiver does

1.Counter effects multi-path fading

2.Resembles equalizer

3.Resembles equalizer & Counter effects multi-path fading

4.None of the mentioned

Question:

Rake receivers are used in

1.Radio astronomy

2.CDMA

3.W-CDMA

4.All of the mentioned

Question:

Small scale fading manifests due to

1.Signal dispersion

2.Time variant behavior

3.Signal dispersion & Time variant behavior

4.None of the mentioned

Question:

Small scale fading occurs due to

1.Doppler shift

2.Time delay

3.Doppler shift & Time delay

4.None of the mentioned

Question:

Small scale refers to changes in

1.Amplitude

2.Phase

3.Amplitude & Phase

4.None of the mentioned

Question:

The decision feedback equalizer has a linear traversal filter which is

1.Feed forward section

2. Feedback section

3.Feed forward section & Feedback section

4.None of the mentioned

Question:

The digital signature provides authentication to the

1.Sender

2.Message

3.Sender & Message

4.None of the mentioned

Question:

The effect of Doppler shift can be counterattacked by

1.OFDM

2.By using two receivers with separate antennas

3.By using diversity receiver

4.All of the mentioned

Question:

The hash function

1.Is collision free

2.Has manageable collision

3.Has high unmanageable level of collision

4.None of the mentioned

Question:

The inter-leaver is more effective if the vehicle is

1.Fast

2.Slow

3.Fast & Slow

4. None of the mentioned

Question:

The ISI and adjacent channel interference is removed by

1.Cancelling filter

2.Port processing equalizer

3.Cancelling filter & Port processing equalizer

4.None of the mentioned

Question:

The parameters used to describe large scale fading are

1.Reference distance

2.Path loss exponent

3.Standard deviation of random variable

4.All of the mentioned

Question:

The rake receivers functions are similar to

1.Equalizer

2.Matched filter

3.Equalizer & Matched filter

4.None of the mentioned

Question:

The received power is attenuated by a factor called

1.Path loss

2.Free space loss

3.Path & Free space loss

4.None of the mentioned

Question:

The technique for combining diversity signals are

1.Feedback

2.Maximal ratio

3.Equal gain

4.All of the mentioned

Question:

Uncorrelated fading occurs when

1.Time span is small

2.Time span is large

3.Does not depend on time span

4.None of the mentioned

Question:

What are the modes of adaptive equalizer?

1.Training mode

2.Tracking mode

3. Training & Tracking mode

4.None of the mentioned

Question:

What are the types of small scale fading that occurs due to Doppler shift?

1.Slow fading

2.Fast fading

3.Slow & Fast fading

4.None of the mentioned

Question:

What is the source for performance degradation?

1.Thermal noise

2.Man made noise

3.Natural noise

4.All of the mentioned

Question:

When a userâ€™s moving, the userâ€™s velocity causes shift in frequency. This is called as

1.Doppler shift

2.Frequency shift

3.Velocity shift

4.None of the mentioned

Question:

When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.

1.Time selective

2.Frequency selective

3.Frequency non selective

4.None of the mentioned

Question:

When channel coherence time is less than the time duration of a transmission symbol, then ______ fading occurs.

1.Fast

2.Slow

3.Time selective

4. None of the mentioned

Question:

When transmitter and receiver moves towards each other, the magnitude of frequency shift is

1.Positive

2.Negative

3.Zero

4.Infinity

Question:

Which is more effective and commonly preferred technique?

1.Time diversity

2.Spatial diversity

3.Frequency diversity

4.None of the mentioned

Question:

Which should be used first to decrypt?

1.Public key

2.Private key

3.Public & Private key

4.None of the mentioned

Question:

Which signalling scheme is preferred for fading channel?

1.Frequency based modulation

2.Phase based modulation

3.Frequency & Phase based modulation

4.None of the mentioned

Posted on by Online Exam TestTeam

More MCQS

Search

Olete Team

Online Exam TestTop Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on Online Exam Testwebsite is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!

Electrical measurements-Digital Communications MCQs set/15 Sample Test,Sample questions

Question: Scintillation describes the fading caused by

Question: A rake receiver uses multiple

Question: Block fading occurs in

Question: Channelâ€™s time spreading properties are

Question: Coherence time is _______ to Doppler spread.

Question: Diversity technique is applied at

Question: Diversity technique is used for combating

Question: DSA protocol is based on

Question: Fading channel has memory.

Question: Fast fading can be minimized by

Question: Flat fading can be avoided or stopped by

Question: Frequency tracking loop can minimize irreducible error rate by using

Question: How can frequency selective distortion be minimized?

Question: How can slow fading be minimized?

Question: If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.

Question: If delay time is greater than symbol time, _______ fading occurs.

Question: If delay time is lesser than symbol time, ______ fading occurs.

Question: If signalling rate is less than fading rate, _____ fading occurs.

Question: In hash function output length is fixed.

Question: Information reliability depends on

Question: Interleaving does

Question: Large scale fading refers the attenuation in

Question: Minimum time required for magnitude change or phase change is called as

Question: Multiple isolated peaks in multipath components is called as

Question: Rake receiver does

Question: Rake receivers are used in

Question: Small scale fading manifests due to

Question: Small scale fading occurs due to

Question: Small scale refers to changes in

Question: The decision feedback equalizer has a linear traversal filter which is

Question: The digital signature provides authentication to the

Question: The effect of Doppler shift can be counterattacked by

Question: The hash function

Question: The inter-leaver is more effective if the vehicle is

Question: The ISI and adjacent channel interference is removed by

Question: The parameters used to describe large scale fading are

Question: The rake receivers functions are similar to

Question: The received power is attenuated by a factor called

Question: The technique for combining diversity signals are

Question: Uncorrelated fading occurs when

Question: What are the modes of adaptive equalizer?

Question: What are the types of small scale fading that occurs due to Doppler shift?

Question: What is the source for performance degradation?

Question: When a userâ€™s moving, the userâ€™s velocity causes shift in frequency. This is called as

Question: When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.

Question: When channel coherence time is less than the time duration of a transmission symbol, then ______ fading occurs.

Question: When transmitter and receiver moves towards each other, the magnitude of frequency shift is

Question: Which is more effective and commonly preferred technique?

Question: Which should be used first to decrypt?

Question: Which signalling scheme is preferred for fading channel?

More MCQS

Search

Olete Team

Question:
Scintillation describes the fading caused by

Question:
A rake receiver uses multiple

Question:
Block fading occurs in

Question:
Channelâ€™s time spreading properties are

Question:
Coherence time is _______ to Doppler spread.

Question:
Diversity technique is applied at

Question:
Diversity technique is used for combating

Question:
DSA protocol is based on

Question:
Fading channel has memory.

Question:
Fast fading can be minimized by

Question:
Flat fading can be avoided or stopped by

Question:
Frequency tracking loop can minimize irreducible error rate by using

Question:
How can frequency selective distortion be minimized?

Question:
How can slow fading be minimized?

Question:
If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.

Question:
If delay time is greater than symbol time, _______ fading occurs.

Question:
If delay time is lesser than symbol time, ______ fading occurs.

Question:
If signalling rate is less than fading rate, _____ fading occurs.

Question:
In hash function output length is fixed.

Question:
Information reliability depends on

Question:
Interleaving does

Question:
Large scale fading refers the attenuation in

Question:
Minimum time required for magnitude change or phase change is called as

Question:
Multiple isolated peaks in multipath components is called as

Question:
Rake receiver does

Question:
Rake receivers are used in

Question:
Small scale fading manifests due to

Question:
Small scale fading occurs due to

Question:
Small scale refers to changes in

Question:
The decision feedback equalizer has a linear traversal filter which is

Question:
The digital signature provides authentication to the

Question:
The effect of Doppler shift can be counterattacked by

Question:
The hash function

Question:
The inter-leaver is more effective if the vehicle is

Question:
The ISI and adjacent channel interference is removed by

Question:
The parameters used to describe large scale fading are

Question:
The rake receivers functions are similar to

Question:
The received power is attenuated by a factor called

Question:
The technique for combining diversity signals are

Question:
Uncorrelated fading occurs when

Question:
What are the modes of adaptive equalizer?

Question:
What are the types of small scale fading that occurs due to Doppler shift?

Question:
What is the source for performance degradation?

Question:
When a userâ€™s moving, the userâ€™s velocity causes shift in frequency. This is called as

Question:
When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.

Question:
When channel coherence time is less than the time duration of a transmission symbol, then ______ fading occurs.

Question:
When transmitter and receiver moves towards each other, the magnitude of frequency shift is

Question:
Which is more effective and commonly preferred technique?

Question:
Which should be used first to decrypt?

Question:
Which signalling scheme is preferred for fading channel?