Practice Quiz in Wire and Wireless Communications System Part 9

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(Last Updated On: February 3, 2020)

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 9 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 IX of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 81. Printed documents to be transmitted by fax are converted into baseband electric signal by the process of

A. Copying

B. Scanning

C. Modulation

D. Light variation


Question 82. What is the frequency separation between the transmit and the receive channels?

A. 30 MHz

B. 45 MHz

C. 55 MHz

D. 40 MHz


Question 83. What is singing?

A. The result of intermodulating two or more signals of different frequencies to produce a tone having a frequency equal to the sum of the frequencies of the signals intermodulated.

B. The result of intermodulating two or more signals of different frequencies to produce a tone having a frequency higher than that of the signal having the highest frequency.

C. An undesired self-sustained oscillation in a system, generally caused by excessive positive feedback.

D. An art or form of entertainment that can make one rich.


Question 84. If you find that an SAW filter output is 6 dB down from the input of a receiver during test, ______.

A. This is normal.

B. The device if faulty

C. The receiver is improperly terminated

D. The filter is not resonating


Question 85. Cause a herringbone pattern in facsimile

A. Single-frequency interference

B. Crosstalk

C. Phase jitter

D. Noise


Question 86. A passive _________ is an electronic device which reduces signal strength by a specified amount in dB.

A. Splitter

B. Filter

C. Trimmer

D. Attenuator


Question 87. The _______ in an FM receiver causes a stronger signal to dominate over a weaker signal on the same frequency.

A. Capture effect

B. Flywheel effect

C. Hall effect

D. Skin effect


Question 88. A cellular phone operates on

A. Half duplex

B. Full duplex

C. Echoplex

D. Lincomplex


Question 89. Typical speech power

A. 10 to 1000 µW

B. 100 to 1000 mW

C. 10 to 1000 nW

D. 100 to 1000 pW


Question 90. What is a two-wire circuit?

A. A circuit usually in the subscriber loop, between the telephone set and the local central office.

B. A circuit having only two terminals, both terminals having the same instantaneous voltage.

C. A circuit with one input terminal, one output terminal, and a common ground.

D. A circuit consisting of two transmission lines.

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