Practice Quiz in Digital and Data Communication Networks Part 16

(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 16 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 XVI of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 151. What property distinguishes digital radio systems from conventional analog communications system?

A. the type of carrier used in the transmission of data

B. the nature of the modulating signal

C. the type of modulation of data to be used

D. the nature of the transmitter and receiver to be used


Question 152. The best frequency demodulator is the

A. PLL discriminator

B. Pulse-averaging discriminator

C. Foster-Seeley discriminator

D. Radio detector


Question 153. A digital modulation technique which is a form of constant – amplitude angle modulation similar to standard frequency modulation except the modulating signal is binary signal that varies between two discreet voltage levels.

A. QAM

B. ASK

C. PSK

D. FSK


Question 154. The supergroup pilot is

A. applied to each multiplexing bay

B. used to regulate the gain of individual repeaters

C. applied at each adjustable equalizer

D. fed in at a GTE


Question 155. It is a numerical indication of how efficiently a PCM code is utilized

A. Coding efficiency

B. Companding

C. Pre-emphasis

D. Dynamic Range


Question 156. In PAM demultiplexing, the receiver clock is derived from

A. standard radio station WWV

B. a highly accurate internal oscillator

C. the PAM signal itself

D. the 60 Hertz power line


Question 157. Refers to the rate of change of a signal on a transmission medium after encoding and modulation have occurred

A. baud rate

B. phase shift

C. bit rate

D. frequency deviation


Question 158. It is the procedure used to decide which device has the permission to transmit at any given time

A. Flow control

B. Sequence control

C. Line control

D. Framing


Question 159. T1 stands for

A. Transmission one

B. Telecommunication one

C. Telex one

D. Transmission line one


Question 160. The ISDN channel D designates _____ which contains control information.

A. Data

B. Flow

C. Control

D. Bearer

List of Practice Quizzes


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