Practice Quiz in Wire and Wireless Communications System Part 17

(Last Updated On: December 21, 2017)

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 17 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 XVII of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 161. How many different tones may be produced by a four-column DTMF keypad?

A. 2

B. 8

C. 4

D. 16

Question 162. A multiple access technique used in GSM cellular system.





Question 163. On-hook current must be kept low so that the

A. Line relays in the central office will not mistake it for off-hook current

B. Comparatively small wires in the cables will not overheat

C. Ringer will not ring incorrectly

D. Carbon microphone will not be damaged

Question 164. The range (in miles) of a cellular CDMA system.

A. 13

B. 30

C. 45

D. 20

Question 165. What kind of modulation is used in modems?

A. Phase modulation

B. Frequency modulation

C. Amplitude modulation

D. All of these

Question 166. The voice frequency channel pass band is

A. 0 to 4000 Hz

B. 300 to 3000 Hz

C. 8140 to 8188 Hz

D. None of these

Question 167. What type of transmitter is most commonly used in a conventional telephone handset?

A. Carbon

B. Electromagnetic

C. Electret

D. Ceramic

Question 168. In digital multiplexing systems, bit interleaving is used in

A. Lower level systems

B. Higher level systems

C. To interleave a code word

D. All of these

Question 169. Which of the following devices increase the battery voltage on a loop and extends its signaling range?

A. Loop extender

B. VF repeater

C. VF amplifier

D. All of these

Question 170. A mobile telephone service using trunked channels but not cellular nature





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