# Practice Quiz in Digital and Data Communication Networks Part 30

Online Practice Quiz in Digital and Data Communication Networks part 30 as one of the Communications Engineering topic.

This is the Online Practice Quiz in Digital and Data Communication Networks Part 30 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 XXX of the Online Practice Quiz

#### Quiz in Digital and Data Communication Networks

Question 291. Sixteen different levels (symbols) are used to encode binary data. The channel bandwidth is 36 MHz. The maximum channel capacity is

A. 18 Mbps

B. 72 Mbps

C. 288 Mbps

D. 2.176 Gbps

Question 292. A form of digital modulation similar to PSK except the digital information is contained in both the amplitude and the phase of the transmitted carrier.

A. ASK

B. FSK

C. QAM

D. PSK

Question 293. What is the minimum bandwidth required to transmit a 56 kbps binary signal with no noise?

A. 14 kHz

B. 56 kHz

C. 28 kHz

D. 112 kHz

Question 294. It is the next higher level in the FDM hierarchy above the basic message channel and consequently is the first multiplexing step for combining message channels

A. Supergroup

B. Group

C. Mastergroup

D. Jumbogroup

Question 295. Element of a PCM system that periodically samples the analog input signal and converts those samples to a multilevel PAM signal

A. Bandpass filter

B. Sample-and-hold circuit

C. Analog-to-digital converter

D. Digital-to-analog converter

Question 296. In digital modulation, a diagram which is similar to phasor diagram except that the entire phasor is not drawn and only the peaks of the phasor are shown

A. constellation diagram

B. Venn diagram

C. phasor diagram

D. schematic diagram

Question 297. What is the relationship of bit rate and baud in FSK and PSK?

A. greater than

B. slightly greater than

C. less than

D. equal

Question 298. The most basic digital symbol used to represent information

A. bit

B. baud

C. bits per second

D. Any of these

Question 299. Type of PCM that uses single-bit PCM code to achieve digital transmission of analog signals

A. Adaptive delta modulation

B. Pulse code modulation

C. Differential modulation

D. Delta modulation

Question 300. A mainframe computer connected to multiple terminals and PCs usually uses which configuration?

A. bus

B. ring

C. star

D. tree

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