Electrical measurements-Digital Communications MCQs set/12 Sample Test,Sample questions

Question:
A cycle slip occurs when the magnitude of the original phase error exceeds

1.Π radians

2.2Ï€ radians

3.Ï€/2 radians

4.Ï€2 radians


Question:
Acquisition is a ______ operation.

1.Linear

2.Non linear

3.Linear & Non linear

4. None of the mentioned


Question:
As the synchronization levels increases, cost

1.Decreases

2.Increases

3.Remains the same

4.None of the mentioned


Question:
Average energy per bit is given by

1.average energy symbol/log2 M

2.average energy symbol * log2 M

3.log2 M/ Average energy symbol

4.none of the mentioned


Question:
Coherent modulation requires ____ level of synchronization.

1.One

2.Two

3.Three

4.None of the mentioned


Question:
Continuous phase modulation has

1.More bandwidth efficiency

2.More smoothness

3.More bandwidth efficiency & smoothness

4.None of the mentioned


Question:
CPM has

1.Narrower bandwidth

2.Wider bandwidth

3.More bandwidth requirement

4.None of the mentioned


Question:
Entropy calculation returns

1.Random variable

2. Deterministic number

3.Random number

4.None of the mentioned


Question:
Entropy of N random variables is the _____ of the entropy of individual random variable.

1.Sum

2.Product

3.Sum of squares

4.Average


Question:
Every frequency has ____ orthogonal functions.

1.One

2.Two

3.Four

4.Six


Question:
For block codes _____ is necessary.

1.Phase synchronization

2.Frequency synchronization

3.Frame synchronization

4.None of the mentioned


Question:
FSK reception is

1.Phase Coherent

2.Phase non coherent

3.Phase Coherent & non coherent

4.None of the mentioned


Question:
FSK reception uses

1.Correlation receiver

2.PLL

3.Correlation receiver & PLL

4.None of the mentioned


Question:
Gaussian noise has _____ power spread _____ over all frequencies.

1.Zero, uniformly

2.Zero, non uniformly

3.Infinite, uniformly

4.Infinite, non uniformly


Question:
If we correlate the received signal with any one of the two orthogonal function, the obtained inner product will be

1.In phase

2.Quadrature

3.Zero

4.Cannot be determined


Question:
If we correlate the received signal with both orthogonal function the inner product will be

1.In phase

2.Quadrature

3.In phase and quadrature

4.Unity


Question:
In non coherent reception _____ is measured.

1.Phase

2.Energy

3.Power

4.None of the mentioned


Question:
In open loop method, the time reference error __________ with respect to time.

1.Increases exponentially

2.Decreases exponentially

3.Increases quadratically

4.Decreases quadratically


Question:
In phase lock which parameter is synchronized

1.Frequency

2.Phase

3.Frequency & Phase

4.None of the mentioned


Question:
In VCO the output frequency is a linear function of its input

1.Frequency

2.Voltage

3.Time period

4. None of the mentioned


Question:
In which modulation schemes, the spreading of spectrum occurs?

1.Frequency modulation

2.Amplitude modulation

3.Frequency & Amplitude modulation

4.None of the mentioned


Question:
Jamming is caused by

1.Multipath

2.Natural phenomena

3.Multipath & Natural phenomena

4.None of the mentioned


Question:
Matched filter is a _____ technique.

1.Modulation

2.Demodulation

3.Modulation & Demodulation

4.None of the mentioned


Question:
Non coherent system requires

1.Phase synchronization

2.Frequency synchronization

3.Phase & Frequency synchronization

4.None of the mentioned


Question:
Phase locked loops consists of

1.Phase detectors

2.Loop filter

3. Voltage controlled oscillator

4.All of the mentioned


Question:
PLL designs have

1.First order loop

2.Second order loop

3.Higher order loop

4.None of the mentioned


Question:
QAM uses ______ as the dimensions.

1.In phase

2.Quadrature

3.In phase & Quadrature

4.None of the mentioned


Question:
Simulation is used to determine

1.Bit error rate

2.Symbol error rate

3.Bit error

4.Symbol error


Question:
Spread spectrum signals are used for

1.Ranging

2.Determination of position

3.Ranging & Determination of position

4.None of the mentioned


Question:
Synchronization is used in system which has

1.Non coherent modulation techniques

2.Many users accessing

3.Non coherent modulation techniques & Many users accessing

4.None of the mentioned


Question:
The number of filters in CPM receiver structure is

1.LM

2.ML

3.M/L

4.None of the mentioned


Question:
The radio meter consists of

1.Low pass filter

2.High pass filter

3.Band pass filter

4.Band reject filter


Question:
The synchronization necessary for BPSK is

1.Frequency tracking

2.Bit timing

3.Phase tracking

4.All of the mentioned


Question:
The system which has ______ signal to noise ratio can tolerate larger timing error.

1.Large

2.Small

3.Large & Small

4.None of the mentioned


Question:
To avoid the loop to be driven to lock, the sweep rate should be

1.Smaller

2.Larger

3.It does not depend on it

4.None of the mentioned


Question:
Transmitter synchronization implies

1.One way communication

2.Two way communication

3.One & Two way communication

4.None of the mentioned


Question:
Uncertainty in the delay measurement is _________ to the bandwidth of signal pulse.

1.Directly proportional

2.Inversely proportional

3.Not related

4.None of the mentioned


Question:
What is the function of the edge detector?

1.Differentiation

2.Rectification

3.Differentiation & Rectification

4.None of the mentioned


Question:
When a terminal is able to utilize the measurements made on the return link it is called as

1.Open loop method

2.Closed loop method

3.Quasi close loop method

4.None of the mentioned


Question:
When phase noise and phase jitter is doubled, the phase variance increases by

1.Two times

2.Four times

3.0.5 times

4.8 times


Question:
Which FSK has no phase discontinuity?

1.Continuous FSK

2.Discrete FSK

3.Uniform FSK

4.None of the mentioned


Question:
Which is called as on-off keying?

1.Amplitude shift keying

2.Uni-polar PAM

3.Amplitude shift keying & Uni-polar PAM

4.None of the mentioned


Question:
Which method has fast acquisition and can work without return link?

1.Open loop method

2.Closed loop method

3.Open & Closed loop method

4.None of the mentioned


Question:
Which method has two way link?

1.Open loop method

2.Closed loop method

3.Open & Closed loop method

4.None of the mentioned


Question:
Which method is more accurate?

1.Closed loop synchronizer

2.Open loop synchronizer

3.Closed & Open loop synchronizer

4.None of the mentioned


Question:
Which method needs precorrect time?

1.Open loop method

2.Closed loop method

3.Open & Closed loop method

4.None of the mentioned


Question:
Which method requires external authority and is inflexible?

1.Open loop method

2.Closed loop method

3.Open & Closed loop method

4.None of the mentioned


Question:
Which reduces the effective distance between signals in signal space?

1.Time error

2.Frequency offset

3.Time error & Frequency offset

4.None of the mentioned


Question:
Which system makes the detection difficult for all users other than the intended users?

1.Low probability of intercept

2.Low probability of detection

3.Low probability of intercept & detection

4.None of the mentioned


Question:
Which system uses QAM?

1.Digital microwave relay

2.Dial up modem

3.Digital microwave relay & Dial up modem

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
  33. Digital Communications MCQs set-16
  34. Digital Communications MCQs set-17
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!