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# Kennedy: MCQ in Digital Communications

This is the Multiple Choice Questions in Chapter 14: Digital Communications from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

#### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Digital signals

a. do not provide a continuous set of values

b. represent values as discrete steps

c. can utilize decimal or binary systems

d. all of the above

Solution:

2. The event which marked the start of the modern computer age was

a. design of the ENIAC computer

b. development of the Hollerith code

c. development of the transistor

d. development of disk drives for data storage

Solution:

3. The baud rate

a. is always equal to the bit transfer rate

b. is equal to twice the bandwidth of an ideal channel

c. is not equal to the signaling rate

d. is equal to one-half the bandwidth of an ideal channel

Solution:

4. The Shannon-Hartley law

a. refers to distortion

b. defines bandwidth

c. describes signaling rates

d. refers to noise

Solution:

5. The code which provides for parity checks is

a. Baudot

b. ASCII

c. EBCDIC

d. CCITT-2

Solution:

6. A forward error-correcting code corrects errors by

a. requiring partial re-transmission of the signal

b. requiring re-transmission of the entire signal

c. requiring no part of the signal to be re-transmitted

d. using parity to correct the errors in all cases

Solution:

7. Full duplex operation

a. requires two pairs of cables

b. can transfer data in both directions at once

c. requires modems at both ends of the circuit

d. all of the above

Solution:

8. The RS-232 interface

a. interconnects data sets and transmission circuit

b. uses several different connectors

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

d. all of the above

Solution:

9. Switching systems

a. improve the efficiency of data transfer

b. are not used in data systems

d. are limited to small data networks

Solution:

10. The data transmission rate of a modem is measured in

a. bytes per second

b. baud rate

c. bits per second

d. megahertz

Solution:

### Complete List of MCQ in Electronic Communication Systems by Kennedy

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