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Data Communication MCQ Questions with Answers | Modulation Quiz Questions

Questions
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

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

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.

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

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

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

Answer: Option [B]
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