Modulation Techniques | Chapter-wise MCQ Questions on Data Communication and Networking with Answers

(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.

(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]

Modulation | Data Communication and Networking Question Bank with Answers