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Modulation | Data Communication and Networking Question Bank with Answers

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Computer Networks & Data Communication short questions and answers set with five mcqs for interview from chapter Data Modulation. Each quiz objective question has 4 options as possible answers. Choose your option and view the given correct answer.
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(6) If original signal is band limited with bandwidth of W, samples are taken, in PCM, once every
[A] 1/W seconds
[B] 1/2W seconds
[C] W seconds
[D] none of these above

Comment

Answer: Option [B]

When original signal is band limited with bandwidth of W, samples are taken, in PCM, once every 1/2W seconds

(7) In PCM
[A] Digital signal is converted into analog signal
[B] Pulse Amplitude modulation samples are quantized
[C] Non-linear coding scheme is undertaken
[D] None of these

Comment

Answer: Option [B]

In Pulse Amplitude modulation signal is sampled at regular intervals at a rate higher than twice the highest signal frequency.

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(8) In MODEMS :
[A] Several digital signal are multiplexed
[B] A digital signal changes some characteristics of a carrier wave
[C] Digital signal is amplified
[D] None of these above

Comment

Answer: Option [B]

Modems modulates or converts digital signal to analog signal and analog signal to digital signal.

(9) Modulation is used to :
[A] Reduce the bandwidth
[B] Separate differing transmission
[C] Ensure that information may be transmitted over long distances
[D] Allow the use of practicable antennas

Comment

Answer: Option [C]

Modulation is used to ensure that information may be transmitted over long distances

(10) One factor in the accuracy of a reconstructed PCM signal is the
[A] Signal bandwidth
[B] Carrier frequency
[C] Number of bits used for quantization
[D] Baud rate

Comment

Answer: Option [C]

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

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