Correct Answer is: None of these

Correct Answer is: None of these above

Correct Answer is: All of the above

Correct Answer is: Sum of code words is also a code word

Digital Communication MCQ Multiple Choice Questions

Q: 1. Two binary values are represented by two different frequencies in :

Correct Answer is: none of these above

Q: 4. ASK is rarely used in modems because

Correct Answer is: none of the above

Q: 5. The qualifier differential to PSK means that

Correct Answer is: none of these above

Q: 8. Modulation is used to

Correct Answer is: Allow the use of practicable antennas

Q: 10. The modulation techniques used to convert analog signal into digital signal are

Correct Answer is: Pulse code modulation

Q: 12. The error probability of a PCM is

Correct Answer is: Calculated using noise and inter symbol interference

Prepare for success with our Digital Communication MCQs, designed for students and exam aspirants to test and enhance their knowledge in this critical field.

About Digital Communication MCQ Questions

Digital Communication MCQs cover essential topics such as data transmission, modulation techniques, error detection, and correction, and more. These questions are structured to ensure a comprehensive understanding of the subject, making them ideal for both beginners and advanced learners.

Why Practice Digital Communication Objective Questions?

Practicing Digital Communication MCQs offers numerous benefits. It helps in preparing for school and college exams, competitive exams, and job interviews. Regular practice enhances your problem-solving skills, reinforces key concepts, and boosts your confidence. Whether you are a student or a professional, these questions are invaluable for your academic and career growth.

Who Should Use These MCQs?

Digital Communication MCQ Questions for Practice

1. Two binary values are represented by two different frequencies in :

frequency-shift-keying
phase-shift-keying
amplitude-shift-keying
none of these above

2. Codec uses

Delta modulation only
PCM and Delta modulation
Pulse code modulation technique only
None of these

3. ASK is a result of combination of Shift keying and

Analog modulation
Amplitude modulation
Digital modulation
None of these above

4. ASK is rarely used in modems because

it is highly susceptible to noise
it takes care of amplitude only
it shifts only between ON and OFF states
none of the above

5. The qualifier differential to PSK means that

it uses phase shifts of 180 degree
phase shift is with reference to the previous bit transmitted
it uses phase shifts of multiple of 90 degree
none of these above

6. In PCM

Pulse Amplitude modulation samples are quantized
Non-linear coding scheme is undertaken
Digital signal is converted into analog signal
None of these

7. In modems

A digital signal changes some characteristics of a carrier wave
Digital signal is amplified
Several digital signal are multiplexed
None of these above

8. Modulation is used to

Separate differing transmission
Ensure that information may be transmitted over long distances
Reduce the bandwidth
Allow the use of practicable antennas

9. One factor in the accuracy of a reconstructed PCM signal is the

Carrier frequency
Number of bits used for quantization
Signal bandwidth
Baud rate

10. The modulation techniques used to convert analog signal into digital signal are

Delta modulation
Adaptive delta modulation
Pulse code modulation
All of the above

11. In PCM, the parameter varied in accordance with the amplitude of the modulating signal is

Frequency
Phase
Amplitude
None of the above

12. The error probability of a PCM is

Gaussian noise + error component due to inter symbol interference
Calculated using power spectral density
Calculated using noise and inter symbol interference
All of the above

13. In Delta Modulation, the bit rate is

N times the modulating frequency
N times the nyquist criteria
N times the sampling frequency
None of the above

14. DPCM is a technique

Where difference between successive samples of the analog signals are encoded into n-bit data streams
Where digital codes are the quantized values of the predicted value
To convert analog signal into digital signal
All of the above

15. Granular noise occurs when

Step size is too large
There is interference from the adjacent channel
Step size is too small
Bandwidth is too large

16. The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

PCM
Adaptive delta modulation
Delta modulation
PAM

17. In Adaptive Delta Modulation, the slope error reduces and

Quantization error increases
Quantization error remains same
Quantization error decreases
None of the above

18. Matched filters may be used

In parameter estimation problems
To estimate the distance of the object
To estimate the frequency of the received signal
All of the above

19. Information rate is defined as

Average number of bits of information per second
rH
Information per unit time
All of the above

20. Entropy is

Information in a signal
Amplitude of signal
Average information per message
All of the above

21. Timing jitter is

Change in frequency
Deviation in location of the pulses
Change in amplitude
All of the above

22. A linear code

All-zero code word is a code word
Minimum hamming distance between two code words is equal to weight of any non zero code word
Sum of code words is also a code word
All of the above

23. Parity bit coding may not be used for

Which bit is in error
Both a & b
Error in more than single bit
None of the above

24. Parity check bit coding is used for

Error detection
Error correction and detection
Error correction
None of the above

25. Run Length Encoding is used for

Bit error correction
Correction of error in multiple bits
Reducing the repeated string of characters
All of the above

26. The number of bits of data transmitted per second is called

Modulation rate
Coding
Data signaling rate
None of the above

27. Pulse shaping is done

by limiting the bandwidth of transmission
after line coding and modulation of signal
to control Inter Symbol Interference
All of the above

28. Nyquist criterion helps in

Reduction in transmission bandwidth
Increase in transmission bandwidth
Transmitting the signal without ISI
Both a and b

29. The Nyquist theorem is

Helps in quantization
Limits the bandwidth requirement
Relates the conditions in time domain and frequency domain
Both a and c

30. ASK modulated signal has the bandwidth

Half the bandwidth of baseband signal
Double the bandwidth of baseband signal
Same as the bandwidth of baseband signal
None of the above

Digital Communication MCQ Multiple Choice Questions for Practice

About Digital Communication MCQ Questions

Why Practice Digital Communication Objective Questions?

Who Should Use These MCQs?

Digital Communication MCQ Questions for Practice

1. Two binary values are represented by two different frequencies in :

2. Codec uses

3. ASK is a result of combination of Shift keying and

4. ASK is rarely used in modems because

5. The qualifier differential to PSK means that

6. In PCM

7. In modems

8. Modulation is used to

9. One factor in the accuracy of a reconstructed PCM signal is the

10. The modulation techniques used to convert analog signal into digital signal are

11. In PCM, the parameter varied in accordance with the amplitude of the modulating signal is

12. The error probability of a PCM is

13. In Delta Modulation, the bit rate is

14. DPCM is a technique

15. Granular noise occurs when

16. The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

17. In Adaptive Delta Modulation, the slope error reduces and

18. Matched filters may be used

19. Information rate is defined as

20. Entropy is

21. Timing jitter is

22. A linear code

23. Parity bit coding may not be used for

24. Parity check bit coding is used for

25. Run Length Encoding is used for

26. The number of bits of data transmitted per second is called

27. Pulse shaping is done

28. Nyquist criterion helps in

29. The Nyquist theorem is

30. ASK modulated signal has the bandwidth

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Digital Communication MCQ Multiple Choice Questions for Practice

About Digital Communication MCQ Questions

Why Practice Digital Communication Objective Questions?

Who Should Use These MCQs?

Digital Communication MCQ Questions for Practice

1. Two binary values are represented by two different frequencies in :

2. Codec uses

3. ASK is a result of combination of Shift keying and

4. ASK is rarely used in modems because

5. The qualifier differential to PSK means that

6. In PCM

7. In modems

8. Modulation is used to

9. One factor in the accuracy of a reconstructed PCM signal is the

10. The modulation techniques used to convert analog signal into digital signal are

11. In PCM, the parameter varied in accordance with the amplitude of the modulating signal is

12. The error probability of a PCM is

13. In Delta Modulation, the bit rate is

14. DPCM is a technique

15. Granular noise occurs when

16. The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

17. In Adaptive Delta Modulation, the slope error reduces and

18. Matched filters may be used

19. Information rate is defined as

20. Entropy is

21. Timing jitter is

22. A linear code

23. Parity bit coding may not be used for

24. Parity check bit coding is used for

25. Run Length Encoding is used for

26. The number of bits of data transmitted per second is called

27. Pulse shaping is done

28. Nyquist criterion helps in

29. The Nyquist theorem is

30. ASK modulated signal has the bandwidth

Your Score

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