Practice Quiz in Digital and Data Communication Networks Part 20

Online Practice Quiz in Digital and Data Communication Networks part 20 as one of the Communications Engineering topic.

Quiz in Digital and Data Communication Networks

This is the Online Practice Quiz in Digital and Data Communication Networks Part 20 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 XX of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 191. __________ defines how a user gets control of the channel so as to allow transmission.

A. channel access

B. collision detection

C. collision avoidance

D. carrier sense


Question 192. The main reason that serial transmission is preferred to parallel transmission is that?

A. serial is faster

B. serial requires only a single channel

C. serial requires multiple channels

D. parallel is too expensive


Question 193. A form of angle – modulated, constant amplitude digital modulation similar to conventional phase modulation except its input is binary digital signal and there are limited numbers of output phase possible.

A. ASK

B. PSK

C. FSK

D. QAM


Question 194. The FDM telephone systems accommodate many channels by

A. Increasing the multiplexer size

B. Using many final carriers

C. Narrowing the bandwidth of each

D. Using multiple levels of multiplexing


Question 195. The RS – 232 interface

A. interconnects data sets and the transmission circuits

B. uses several different connectors

C. permits custom wiring of signal lines to the connector pins as desired

D. All of these


Question 196. Ethernet is baseband transmission system designed by _____.

A. Thomas Murray and Robert Metcalfe

B. David Boggs and Thomas Murray

C. Thomas Murray and Emile Baudot

D. Robert Metcalfe and David Boggs


Question 197. What is the bandwidth required to transmit at a rate of 10 Mbps in the presence of a 28-bd S/N ratio?

A. 1.075 MHz

B. 10 MHz

C. 5 MHz

D. 10.5 MHz


Question 198. It is also known as digital modulation

A. Digital transmission

B. Digital sampling

C. Digital radio

D. Data transmission


Question 199. Which of the following is not a typical FDM application?

A. Telemetry

B. Stereo broadcasting

C. Telephone

D. Secure communications


Question 200. What is the final output of a multiplexer?

A. Baseband

B. Composite baseband

C. Information

D. Composite carrier

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