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Practice Quiz in Digital and Data Communication Networks Part 31

(Last Updated On: December 20, 2017)Quiz in Digital and Data Communication Networks

This is the Online Practice Quiz in Digital and Data Communication Networks Part 31 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 XXXI of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 301. Each signal in an FDM signal

A. modulates the main carrier

B. modulates the final carrier

C. is mixed with all the others before modulation

D. serves as a subcarrier


Question 302. How many voice channels are there in supermaster group?

A. 300

B. 900

C. 3600

D. 10800


Question 303. It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder

A. codec

B. muldem

C. vocoders

D. modem


Question 304. In delta modulation, the modulator is sometimes called _____.

A. continuous ADC

B. tracking ADC

C. variable slope ADC

D. slope ADC


Question 305. The modulation used in FDM telephone system is

A. AM

B. FM

C. SSB

D. PSK


Question 306. For the 16-PSK and a transmission system with a 10 kHz bandwidth, determine the maximum bit rate

A. 40,000 bps

B. 80,000 bps

C. 20,000 bps

D. 16,000 bps


Question 307. It is a large scale integration chip designed for use in telecommunication industry for private branch exchanges, central office switches, digital handsets and digital echo suppressors.

A. Vocoder

B. Modem

C. Codec

D. Muldem


Question 308. The most common circuit used for demodulating binary FSK signals

A. phase locked loop

B. Foster-Seeley discriminator

C. varactor

D. phase shift method


Question 309. Frequency modulation in FDM usually accomplished with a

A. reactance modulator

B. varactor

C. VCO

D. PLL


Question 310. In a PAM/TDM system, keeping the multiplexer and DEMUX channels step with one another is done by a

A. clock recovery circuit

B. sync pulse

C. sampling

D. sequencer

List of Practice Quizzes


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