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Data Communication MCQ Questions with Answers | Modulation Quiz Questions

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Data Modulation multiple choice questions and answers set with five mcqs for NIELIT, BCA, B.Sc. MCA, M.Sc(IT), BE, B.Tech, CCNA, MCSE exams. Each quiz objective question has 4 options as possible answers. Choose your option and view the given correct answer.
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(1) Two binary values are represented by two different frequencies in :
[A] amplitude-shift-keying
[B] frequency-shift-keying
[C] phase-shift-keying
[D] none of these above

Comment

Answer: Option [B]

Frequency shift keying is a digital signal transmission method in which the two binary states (logic 0 for low and logic 1 for high) are represented by carrier waves.

(2) Codec uses
[A] Pulse code modulation technique only
[B] Delta modulation only
[C] PCM and Delta modulation
[D] None of these

Comment

Answer: Option [C]

Codec(coder/decoder) uses both Pulse-code-modulation and Delta modulation. This combines analog-to-digital conversion and digital-to-analog conversion.

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(3) ASK is a result of combination of Shift keying and
[A] Digital modulation
[B] Analog modulation
[C] Amplitude modulation
[D] None of these above

Comment

Answer: Option [C]

ASK is a result of combination of shift keying and amplitude modulation.

(4) ASK is rarely used in modems because
[A] it shifts only between 'ON' and 'OFF' states
[B] it is highly susceptible to noise
[C] it takes care of amplitude only
[D] none of the above

Comment

Answer: Option [B]
(5) The qualifier differential to PSK means that
[A] it uses phase shifts of multiple of 90 degree
[B] it uses phase shifts of 180 degree
[C] phase shift is with reference to the previous bit transmitted
[D] none of these above

Comment

Answer: Option [B]

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DATA COMMUNICATION & COMPUTER NETWORKS – MULTIPLE CHOICE QUESTIONS AND ANSWERS | 250 MCQS

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