Practice Quiz in Wire and Wireless Communications System Part 12

This is the Online Practice Quiz in Wire and Wireless Communications System Part 12 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 XII of the Online Practice Quiz

Quiz in Wire and Wireless Communications System Question 111. PABX means A. Private All-purpose Broadcasting Exchange B. Private Automatic Branch Exchange C. Public Access Bi-directional Exchange D. Public Automatic Branch Exchange Question 112. In FM fax, the frequencies for black and white are ______ respectively. A. 1500 and 2300 Hz B. 2300 and 1500 Hz C. 1300 and 2400 Hz D. 1070 and 1270 Hz Question 113. What is the system capacity of AMPS? A. 30,000 B. 60,000 C. 100,000 D. 120,000 Question 114. What is used to transmit more than one conversation over a path? A. Hybrid B. Tandem C. Multiplexing D. All of these Question 115. The number of control channels for AMPS A. 25 B. 23 C. 21 D. 19 Question 116. Which function is not required in an integrated telephone circuit? A. Regulator B. Dialer C. Visual display D. Speech network Question 117. A special rectifier bridge is used in electronic telephone because A. The ac power must be converted to dc to simulate a battery B. it is necessary to shunt the speech frequencies and keep them off of the loop C. the voltage drop across conventional bridges leaves too little voltage to operate the set D. All of these Question 118. Cellular CDMA system uses what modulation method? A. GFSK B. ASK C. QAM D. BPSK Question 119. How many unique tones are used for the 12-key dual-tone multi-frequency keypad? A. 2 B. 4 C. 7 D. 12 Question 120. Status information provided by telephone signaling. A. Busy tone, dial tone and ringing B. Congestion and call charge data C. All of these D. None of these

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