Practice Quiz in Digital and Data Communication Networks Part 18

Quiz in Digital and Data Communication Networks

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This is the Online Practice Quiz in Digital and Data Communication Networks Part 18 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 XVIII of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 171. Part of the PCM system that prevents aliasing or foldover distortion

A. Bandpass filter

B. Anti – foldover distortion

C. Anti – aliasing

D. Any of these

Question 172. The ISDN channel B designates _________.

A. Bearer

B. Data

C. Control

D. Flow

Question 173. It is the process of compressing and expanding and is a means of improving the dynamic range of communications system.

A. Pre-emphasis

B. Filtering

C. De-emphasis

D. Companding

Question 174. It is a the symmetrical expectation of the bit error rate in the system

A. probability of errors

B. error detection

C. error control

D. bit error rate

Question 175. Which medium is the least susceptible to noise?

A. twin lead

B. fiber – optic cable

C. twisted pair

D. coax

Question 176. Dividing the data block by a constant produces a remainder that is used for error detection. It is called the

A. Vertical redundancy check

B. Horizontal redundancy check

C. Block check character

D. Cyclic redundancy check

Question 177. 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

Question 178. A basic group B

A. Occupies the frequency range from 60 to 108 kHz

B. Consists of erect channels only

C. Is formed at the group translating equipment

D. Consists of 5 supergroups

Question 179. Start and stop bits, respectively, are

A. Mark, space

B. Space, mark

C. Space, space

D. Mark, mark

Question 180. 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

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