Practice Quiz in Wire and Wireless Communications System Part 10

This is the Online Practice Quiz in Wire and Wireless Communications System Part 10 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.

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Quiz in Wire and Wireless Communications System Question 91. A triple conversion superheterodyne receiver, diode mixer stages are A. Operated in the linear region B. Operated in the nonlinear region C. Operated as Class-A amplifiers D. Operated as Class-B amplifiers Question 92. Which stage increases the selectivity of the circuit in an AM receiver? A. Detector B. IF stage C. Modulator D. Mixer Question 93. What is an Erlang? A. It is a unit of magnetic field intensity measured around a conductor B. It is the number of erroneous bits received per unit of time C. It a unit of electrical energy radiated in space. D. It is equal to the number of simultaneous calls originated during a specific hourly period. Question 94. The other name of Class 2 office in the North American Switching Plan. A. Primary center B. Section C. Regional center D. Toll points Question 95. What is the frequency band of DECT? A. 1.88 – 1.90 GHz B. 1.68 – 1.70 GHz C. 1.48 – 1.50 GHz D. 1.28 – 1.30 GHz Question 96. What is the beamwidth of the reflector of the receiving antenna in the base station? A. 20 degrees B. 30 degrees C. 50 degrees D. 60 degrees Question 97. The resistance limit for No. 2 Crossbar Exchange (US) is A. 1300 Ω B. 2000 Ω C. 1250 Ω D. 1200 Ω Question 98. ______ theory is deciding between a set of hypothesis when given a collection of imperfect measurements. A. Estimation B. Traffic C. Decision D. Nyquist Question 99. The maximum voice energy is located between A. 250 and 500 Hz B. 1000 and 3000 Hz C. 500 and 1000 Hz D. 3000 and 5000 Hz Question 100. How many simultaneous calls does a DECT radio transceiver can assess at any given time? A. 120 B. 240 C. 480 D. 960

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