Practice Quiz in Wire and Wireless Communications System Part 46

This is the Online Practice Quiz in Wire and Wireless Communications System Part 46 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 XLVI of the Online Practice Quiz

Quiz in Wire and Wireless Communications System Question 451. The switch closure in an off-hook condition causes a range of dc current to flow on the loop, what is that range of current? A. 23 mA to 50 mA B. 15 mA to 30 mA C. 10 mA to 20 mA D. 20 mA to 80 mA Question 452. Signals that provides information in the form of announcements, such as number changed to another number, a number no longer in service, and so on. A. addressing B. ringing C. controlling D. supervising Question 453. It is the decrease in gain of more than 12 dB lasting longer than 4 ms and is a characteristics of temporary open circuit conditions and are generally caused by deep fades in radio facilities or by switching delays. A. echo B. jitter C. gain hits D. dropouts Question 454. It is a central location where subscribers are interconnected, either temporarily or on a permanent basis. A. central offices B. exchange offices C. exchanges D. any of these Question 455. It is the exchange of signaling messages over local loops between stations and telephone company switching machines. A. loop signaling B. station signaling C. interoffice signaling D. pulse signaling Question 456. In telephony, functions that supply and interpret control and supervisory signals needed to perform the operation A. calling functions B. maintenance functions C. signaling functions D. transmission functions Question 457. It provides access to the SS7 network access to databases used by switches inside and outside of the network, and transfer of SS7 messages to other signaling points within the network. A. point codes B. signaling points C. service points D. switching points Question 458. In FM fax, the frequencies for black and white are A. 1500 and 2300 Hz B. 2200 and 1500 Hz C. 1300 and 2400 Hz D. 1070 and 1270 Hz Question 459. The telephone switching plan that allows a certain degree of route selection when establishing a phone call. A. NPA B. switching hierarchy C. toll hierarchy D. interoffice hierarchy Question 460. It is the time required to propagate a change in an AM envelope through a transmission medium. A. envelope delay distortion B. phase delay C. envelope delay D. propagation time

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