# Practice Quiz in Digital and Data Communication Networks Part 29

Online Practice Quiz in Digital and Data Communication Networks part 29 as one of the Communications Engineering topic.

This is the Online Practice Quiz in Digital and Data Communication Networks Part 29 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 XXIX of the Online Practice Quiz

#### Quiz in Digital and Data Communication Networks

Question 281. It is an empirical record of a system’s actual bit error performance.

A. probability of error

B. error detection

C. error control

D. bit error rate

Question 282. For an 8-PSK system, operating with an information bit rate of 24 kbps, determine the bandwidth efficiency

A. 8 bits/cycle

B. 2 bits/cycle

C. 3 bits/cycle

D. 4 bits/cycle

Question 283. The event which marked the start of the modern computer age was

A. design of the ENIAC computer

B. development of Hollerith code

C. development of the transistor

D. development of disk drives for data storage

Question 284. An FDM hierarchy which is formed by frequency – division multiplexing five groups containing 12 channels each for a combined bandwidth of 240 kHz.

A. Supergroup

B. Group

C. Mastergroup

D. Jumbogroup

Question 285. A theory that establishes the minimum sampling rate that can be used for a given PCM systems

A. Nyquist sampling theorem

B. Nyquist minimum bandwidth

C. Nyquist minimum bandwidth

D. Any of these

Question 286. The result whenever the sampling rate is less than twice the highest audio frequency

A. peak limiting

C. alias

D. quantizing noise

Question 287. The characters making up the message in a synchronous transmission are collectively referred to as the data

A. set

B. sequence

C. block

D. collection

Question 288. A form of switching which is hold and forward

A. Packet switching

B. Message switching

C. Circuit switching

D. Digital switching

Question 289. Which of the following is not a common LAN medium?

B. twisted pair

C. fiber-optic cable

D. coax

Question 290. A form of switching which is stored and forward

A. Packet switching

B. Message switching

C. Circuit switching

D. Digital switching

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