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Digital Communication MCQ Questions and Answers for Practice

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?

Students preparing for school or college exams
Competitive exam aspirants
Candidates preparing for interviews

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

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