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
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
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
4. The Shannon-Hartley law
- a. refers to distortion
- b. defines bandwidth
- c. describes signaling rates
- d. refers to noise
5. The code which provides for parity checks is
- a. Baudot
- b. ASCII
- c. EBCDIC
- d. CCITT-2
6. A forward error-correcting code corrects errors by
- a. requiring partial retransmission of the signal
- b. requiring retransmission of the entire signal
- c. requiring no part of the signal to be retransmitted
- d. using parity to correct the errors in all cases
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
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
9. Switching systems
- a. improve the efficiency of data transfer
- b. are not used in data systems
- c. require additional lines
- d. are limited to small data networks
10. The data transmission rate of a modem is measured in
- a. bytes per second
- b. baud rate
- c. bits per second
- d. megahertz
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