Electrical measurements-Digital Communications MCQs set/11 Sample Test,Sample questions

Question:
 In TDM, at the receiver end, ____ filter is used.

1.Low pass

2.High pass

3. Band pass

4.Band stop


Question:
A PAM signal can be detected using

1.Low pass filter

2.High pass filter

3.Band pass filter

4.All pass filter


Question:
A PWM signal can be generated by

1.An astable multi vibrator

2.A monostable multi vibrator

3.Integrating a PPM signal

4.Differentiating a PPM signal


Question:
An amplifier uses ______ to take input signal.

1.DC power

2.AC power

3.DC & AC power

4.None of the mentioned


Question:
Analogue switches provides

1.Good bandwidth

2.Low distortion

3.Low cost

4.All of the mentioned


Question:
Class B linear amplifiers have maximum power efficiency of

1.50%

2.75%

3.78.5%

4.None of the mentioned


Question:
Coherent demodulation of FSK signal can be performed using

1.Matched filter

2.BPF and envelope detectors

3.Discriminator

4.None of the mentioned


Question:
Delta modulation is ______ conversion.

1.Analog to digital

2.Digital to analog

3.Analog to digital and digital to analog

4.None of the mentioned


Question:
Flat top sampling of low pass signals

1.Gives rise to aperture effect

2.Implies over sampling

3.Leads to aliasing

4.Introduces delay distortion


Question:
For non coherent reception of PSK _____ is used.

1.Differential encoding

2.Decoding

3.Differential encoding & Decoding

4.None of the mentioned


Question:
For which quantization process is used?

1.Amplitude discretization

2.Time discretization

3.Amplitude & Time discretization

4.None of the mentioned


Question:
Free space in idealization which consists

1.Transmitter

2.Receiver

3.Transmitter & Receiver

4.None of the mentioned


Question:
In a delta modulation system, granular noise occurs when the

1.Modulating signal increases rapidly

2.Pulse rate decreases

3.Pulse amplitude decreases

4.Modulating signal remains constant


Question:
In an ideal TDM system, the cross correlation between two users of the system is

1.1

2.0

3.Infinity

4.-1


Question:
In bipolar codes, pulses can be

1.Positive

2.Negative

3.Absent

4.All of the mentioned


Question:
In channel encoding procedure

1.Redundancy bits are added

2.Errors are corrected

3.Redundancy bits are added & Errors are corrected

4. None of the mentioned


Question:
In finite state machines, output is predicted using

1.Past output

2.Present input

3.Past output & Present input

4.None of the mentioned


Question:
In M-ary FSK as M tends to infinity, probability of error tends to

1.Infinity

2.Unity

3.Zero

4.None of the mentioned


Question:
In M-ary FSK, as M increases error

1.Increases

2.Decreases

3.Does not get effected

4.Cannot be determined


Question:
In TCM channel capacity can be increased.

1.True

2.False


Question:
In TCM the signals are decoded using

1.Soft decision decoders

2.Hard decision decoders

3. Soft & Hard decision decoders

4.None of the mentioned


Question:
In time division system, the actual switch is called as

1.Speech memory

2.Cross point

3.Connecting point

4.None of the mentioned


Question:
In time division, connection is established using

1.Data exchange

2.Galvanic connection

3.Data exchange & Galvanic connection

4.None of the mentioned


Question:
Modulation process corresponds to ______ the amplitude, frequency or phase.

1.Switching

2.Keying

3.Switching or keying

4.None of the mentioned


Question:
Modulation process includes

1.Analog to digital conversion

2.Digital to analog conversion

3.All of the mentioned

4.None of the mentioned


Question:
Operations performed by switching system

1.Path establishment

2.Information exchange

3.Tariff computation

4.All of the mentioned


Question:
PCM includes the process of

1.Amplitude discretization

2.Time discretization

3.Amplitude & Time discretization

4.None of the mentioned


Question:
Properties used to determine stream’s fidelity

1.Sampling rate

2.Bit depth

3.Sampling rate & Bit depth

4.None of the mentioned


Question:
Source of noise in delta modulation is

1.Granularity

2.Slope overload

3.Granularity & Slope overload

4.None of the mentioned


Question:
Space division has dedicated

1.Paths

2.Time slots

3.Paths & Time slots

4.None of the mentioned


Question:
Switching exists in

1.Point to point communication

2.Broadcast communication

3.Point to point & Broadcast communication

4.None of the mentioned


Question:
TDM is less immune to cross-talk in channel than FDM.

1.True

2.False


Question:
TDM requires

1.Constant data transmission

2. Transmission of data samples

3.Transmission of data at random

4.Transmission of data of only one measured


Question:
The demodulator in delta modulation technique is

1.Differentiator

2.Integrator

3.Quantizer

4.None of the mentioned


Question:
The TCM decoder uses

1.Minimum likelihood detector

2.Maximum likelihood detector

3.Does not use redundant bits

4.None of the mentioned


Question:
The use of non uniform quantization leads to

1.Reduction in transmission bandwidth

2.Increase in maximum SNR

3.Increase in SNR for low level signals

4.Simplification of quantization process


Question:
Time division multiplexing uses

1.High pass filter

2.Commutator

3.High pass filter & Commutator

4.None of the mentioned


Question:
To achieve high signal to noise ratio, delta modulation must use

1.Under sampling

2.Over sampling

3.Aliasing

4.None of the mentioned


Question:
Transmission bandwidth depends on

1.Rate of signalling

2.Density of signal points

3.Reduced distance

4.None of the mentioned


Question:
Trellis coded modulation scheme

1.Has memory

2. Is memory-less

3.Needs more bandwidth

4.None of the mentioned


Question:
When probability of receiving a symbol is 1 then how much information will be obtained?

1.Little information

2.Much information

3.No information

4.None of the mentioned


Question:
Which determines the error performance in TCM?

1.Reduced distance

2.Free distance

3.Bandwidth

4.None of the mentioned


Question:
Which generates high distortion?

1.Class A

2.Class B

3.Class C

4.Class AB


Question:
Which has 50% maximum power efficiency?

1.Class A

2.Class B

3.Class AB

4.None of the mentioned


Question:
Which has higher error probability performance?

1.Uni-polar base-band signalling

2.Bipolar base-band signalling

3.ASK

4.FSK


Question:
Which has same probability of error?

1.ASK and FSK

2.ASK and PSK

3.PSK and FSK

4. None of the mentioned


Question:
Which has the maximum power efficiency?

1.Class A

2.Class B

3.Class C

4.Class AB


Question:
Which modulation technique have the same bit and symbol error probability?

1.BPSK

2.DPSK

3.OOK

4.All of the mentioned


Question:
Which of the following requires a synchronizing signal?

1.Single channel PPM system

2.PAM

3.DM

4.All of the mentioned


Question:
Which provides more secure communication?

1.CDMA

2.FDMA

3.TDMA

4.None of the mentioned


More MCQS

  1. Electrical Measurement MCQ Question Set 1
  2. Electrical Measurement MCQ Question Set 2
  3. Electrical Measurement MCQ Question Set 3
  4. Electrical Measurement MCQ Question Set 4
  5. Electrical Measurement MCQ Question Set 5
  6. Electrical Measurement MCQ Question Set 6
  7. Electrical Measurement MCQ Question Set 7
  8. Electrical Measurement MCQ Question Set 8
  9. Electrical Measurement MCQ Question Set 9
  10. Electrical Measurement MCQ Question Set 10
  11. Electrical Measurement MCQ Question Set 11
  12. Electrical Measurement MCQ Question Set 12
  13. Electrical Measurement MCQ Question Set 13
  14. Electrical Measurement MCQ Question Set 14
  15. Electrical Measurement MCQ Question Set 15
  16. Electrical Measurement MCQ Question Set 16
  17. Electrical Measurement MCQ Question Set 17
  18. Digital Communications MCQs set-1
  19. Digital Communications MCQs set-2
  20. Digital Communications MCQs set-3
  21. Digital Communications MCQs set-4
  22. Digital Communications MCQs set-5
  23. Digital Communications MCQs set-6
  24. Digital Communications MCQs set-7
  25. Digital Communications MCQs set-8
  26. Digital Communications MCQs set-9
  27. Digital Communications MCQs set-10
  28. Digital Communications MCQs set-11
  29. Digital Communications MCQs set-12
  30. Digital Communications MCQs set-13
  31. Digital Communications MCQs set-14
  32. Digital Communications MCQs set-15
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  34. Digital Communications MCQs set-17
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