Practice Quiz in Digital and Data Communication Networks Part 8

Online Practice Quiz in Digital and Data Communication Networks part 8 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 8 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 VIII of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 71. Ergonomics

A. Involves the interface between people and machines, such as terminals

B. Is the application of ergo-economics to communications

C. Utilizes three-level ergo-coding for transmission over certain channels

D. All of these

Question 72. Codes are always

A. Eight bits per character

B. Either seven or eight bits per character

C. Agreed upon in advance between sender receiver

D. The same in all modern computers

Question 73. The purpose of a preamble in an Ethernet is

A. Clock synchronization

B. Error checking

C. Collision avoidance

D. Broadcast

Question 74. The amount of uncertainty in a system of symbols is also called

A. Bandwidth

B. Loss

C. Entropy

D. Quantum

Question 75. Which of the following systems is the most capable of servicing a wide range of applications?

A. Digital PBX

B. CSMA/CD baseband system

C. Token-passing network

D. Broadband cable system

Question 76. The X.25 standard specifies how many separate protocol layers at the serial interface gateway?

A. 8

B. 2

C. 4

D. 3

Question 77. Serial and parallel transmission

A. Differ in how many bits are transferred per character

B. Are used in synchronous and asynchronous systems, respectively

C. Both a and b

D. Differ in whether the bits are on separate wires or on one

Question 78. Which of the following is not a useful property of a Manchester line code for an Ethernet?

A. Continuous energy

B. Continuous clock transmissions

C. No dc component

D. No signal change at a 1 to 0 transition

Question 79. The digital-to-analog converter in a synchronous modem sends signals to the

A. Modulator

B. Transmission line

C. Terminal

D. Equalizer

Question 80. Serial printers

A. Are used to transmit grain prices

B. Are faster than CRT terminals, and offer more flexibility

C. Print one character at a time

D. Usually use serial interfaces

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