Practice Quiz in Digital and Data Communication Networks Part 15

(Last Updated On: December 20, 2017)

Quiz in Digital and Data Communication Networks

This is the Online Practice Quiz in Digital and Data Communication Networks Part 15 as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

Continue Part XV of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 141. The circuit switch is a _______ switch.

A. See – through

B. Transparent

C. Vague

D. Opaque

Question 142. It is the ratio of the transmission bit rate to the minimum bandwidth required for a particular modulation scheme.

A. Bandwidth efficiency

B. Spectral efficiency

C. Information density

D. All of these

Question 143. The biggest disadvantage of PCM is

A. its inability to handle analog signals

B. the high error rate which is quantizing noise introduces

C. its incompatibility with TDM

D. the large bandwidths that are required for it

Question 144. The OSI layer that provides the control functions necessary to establish, manage and terminated the connections as required to satisfy the user request.

A. Application layer

B. Network layer

C. Session layer

D. Physical layer

Question 145. The circuit that performs demultiplexing in an FDM system is _____.

A. Op - Amp

B. Bandpass filter

C. Discriminator

D. Subcarrier oscillator

Question 146. Any rounded – off errors in the transmitted signal are reproduced when the code is converted back to analog in the receiver.

A. Aperture error

B. Quantization error

C. Aperture distortion

D. Slope overload

Question 147. The building block of a parity or BCC generator is _________.

A. Shift register


C. 2 – to – 4 level converter


Question 148. An IC that contains A/D and D/A converters, companders, and parallel-to-serial converters is called a

A. Codec

B. Data converter

C. Multiplexer

D. Modem

Question 149. The most common method used for sampling voice signals in PCM systems

A. unnatural sampling

B. flat top sampling

C. natural sampling

D. free sampling

Question 150. Which of the following is not primarily type of data communications?

A. a telephone

B. teletype

C. telegraph


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Practice Quiz in Digital and Data Communication Networks Part 15
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