Practice Quiz in Wire and Wireless Communications System Part 15

Quiz in Wire and Wireless Communications System

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This is the Online Practice Quiz in Wire and Wireless Communications System Part 15 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 XV of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 141. Modems are required to connect to telephone lines because

A. The telephone network bandwidth is too high

B. The telephone network will not pass direct current

C. Telephone company rules require them

D. None of these

Question 142. What is the voted cellular digital standard at TIA?

A. Digital AMPS

B. GSM

C. CDMA

D. TACS

Question 143. Group 3 fax uses which modulation?

A. QAM

B. ASK

C. PSK

D. GFSK

Question 144. Protocols may be

A. Bit oriented

B. Byte oriented

C. Character oriented

D. All of these

Question 145. Voltage and current regulation

A. Is provided by the central office

B. Is needed to ensure proper IC operation

C. Can be performed by circuits built into the IC

D. B and C above

Question 146. The channel separation of GSM channel

A. 270 kHz

B. 200 kHz

C. 120 kHz

D. 60 kHz

Question 147. A code for a 64-interval must produce how many bits?

A. 2

B. 10

C. 8

D. 7

Question 148. In a cellular system, ________ is used to measure the spectrum efficiency.

A. Radio efficiency

B. Diversity

C. Frequency reuse

D. Radio capacity

Question 149. The telephone network is being converted to digital operation primarily to

A. Carry digital computer data

B. Reduce costs

C. Improve speech quality

D. Increase system capacity

Question 150. Overvoltage protection is

A. Needed in the telephone set because of the high ringing voltage

B. Is nearly always incorporated in the IC chip

C. Is primarily a central office function

D. Needed because of transients from dial pulsing, lightning, induction or short circuit

List of Practice Quizzes

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