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Modulation | Data Communication and Networking Question Bank with Answers

Questions
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

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

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

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

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

Answer: Option [C]

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