# Practice Quiz in Digital and Data Communication Networks Part 4

Online Practice Quiz in Digital and Data Communication Networks part 4 as one of the Communications Engineering topic.

This is the Online Practice Quiz in Digital and Data Communication Networks Part 4 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 IV of the Online Practice Quiz

#### Quiz in Digital and Data Communication Networks

Question 31. A ______ is a device that is a source of or a destination for binary digital data.

A. Data terminal equipment

B. Data transmission equipment

C. Digital terminal encoder

D. Data-circuit terminating equipment

Question 32. A modulator converts a (an) ______ signal to a (an) __________ signal.

A. Digital, analog

B. Analog, digital

C. PSK, FSK

D. FSK, PSK

Question 33. A broadcast TV channel has a bandwidth of 6 MHz. Ignoring noise, calculate the maximum data rate that could be carried in a TV channel using a 16-level code and determine the minimum possible signal-to-noise ratio in dB for the calculated data rate.

A. 24 Mbps, 48 dB

B. 48 Mbps, 24 dB

C. 24 Mbps, 24 dB

D. 48 Mbps, 48 dB

Question 34. If the bit rate for an ASK signal is 1200 bps, the baud rate is

A. 300

B. 400

C. 600

D. 1200

Question 35. PCM is an example of __________ encoding.

A. Digital-to-digital

B. Digital-to-analog

C. Analog-to –analog

D. Analog-to-digital

Question 36. If the baud rate is 400 for a 4-PSK, the bit rate is ______ bps.

A. 100

B. 400

C. 800

D. 1600

Question 37. The maximum data rate for RS-442 is ________ times that of the maximum RS-423 data rate.

A. 0.1

B. 10

C. 100

D. 500

Question 38. Determine the bandwidth efficiency for QPSK modulation scheme at a transmission rate of 10 Mbps.

A. 2 bits/cycle

B. 4 bits/cycle

C. 8 bits/cycle

D. 16 bits/cycle

Question 39. For a PCM system with a maximum decoded voltage at the receiver of ±2.55 V and minimum dynamic range of 46 dB, determine the maximum quantization error.

A. 5.0 V

B. 0.5 V

C. 0.005 V

D. 0.05 V

Question 40. Unipolar, bipolar, and polar encoding are types of ___________ encoding.

A. Digital-to-digital

B. Digital-to-analog

C. Analog-to-analog

D. Analog-to-digital

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