Practice Quiz in Wire and Wireless Communications System Part 49

This is the Online Practice Quiz in Wire and Wireless Communications System Part 49 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 XLIX of the Online Practice Quiz

Quiz in Wire and Wireless Communications System Question 481. An envelope delay distortion test on a basic telephone channel indicated that an 1800-Hz carrier experienced the minimum absolute delay of 400 us. The maximum envelope delay for a basic telephone channel is 1750 us within the frequency range 800 Hz to 2600 Hz. What is the maximum envelope delay? A. 2150 microsec B. 2550 microsec C. 3000 microsec D. 3400 microsec Question 482. In telephony, functions that involve the actual transmission of a subscriber’s messages and any necessary control signals. A. transmission functions B. signaling functions C. maintenance functions D. calling functions Question 483. It is simply a path between two subscribers and is comprised of one or more switches, two local loops or possibly one or more trunk circuits. A. way B. route C. path D. mode Question 484. In telephony, the -48V dc voltage was used rather than ac voltages because A. to prevent power supply hum B. to allow service to continue in the event of power outage C. because people are afraid of AC D. All of these Question 485. In facsimile, the length of time required to transmit a document. A. propagation time B. transmission rate C. holding time D. transmission time Question 486. A cross-connect point used to distribute the larger feeder cable into smaller distribution cables A. SLIC B. serving area interface C. LATA D. cross-connect cabinet Question 487. Interstate long distance telephone calls require a small telephone office called _________. A. sectional office B. regional office C. toll office D. end office Question 488. It is a measure of how well we can distinguish closely spaced objects or identify small items on a print. A. resolution B. legibility C. contrast D. hue Question 489. It is the difference in circuit gain experienced at a particular frequency with respect to the circuit gain of a reference frequency. A. dynamic range B. absorption distortion C. attenuation distortion D. selective fading Question 490. A call that cannot be completed because the necessary trunk circuits or switching paths are not available. A. blocking B. holding C. storing D. None of these

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