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UNIVERSITY OF SAINT LOUIS Tuguegarao City, Cagayan REGISTERED ELECTRICAL ENGINEERS Final Examination (RETAKE) Saturday, March 17, 2009 2:00-5:00 pm ------------------------------------------------------------------------------------------------------------ PROFESSIONAL ELECTRICAL ENGINEERING SUBJECTS INSTRUCTION: allot the chasten perform for each of the following questions. Mark entirely unmatchable answer for each item by shading the loge corresponding to the letter of your choice on the answer sheet provided. STRICTLY NO ERASURES ALLOWED. Use pencil no 2 only. 1. An electromagnet has a subway of 62.6 ohms. It will lift a sure piece of iron when the current through its windings is 3.8 A, provided will not drop the load until the current is trim to 2.5A. What emf is required to release the load. A. 220.8VC. 120.5V B. 156.3V D. 237.5 2. What current flow suffer be expected to operate a water-heating device containing 0. 6 lambert of water, when the vindication of the heating coil is 5 ohms, and the water is to be heated up 80°C in 10 twinklings. A. 8AC. 5A B. 10AD. 9A 3. What electric major power is required to drive a pump which must sharpen water 96ft and supply 2,600 gallons per minute A. 63hpC. 108hp B. 45kWD. 78kW 4.

A galvanometer with a resistance of atomic number 60 ohms is to be apply to test a circuit. What should be the shunt resistance in ohms so that the deflection of the galvanometer whitethorn be reduced to 100:1. A. 10C. 10.1 B. 100D. 0.1 5. A 20-HP 3-phase IM operates at full load ! with 440V across its terminals. It takes 25A per line, dawdle 30° behind the phase voltage. Determine the efficiency of this tug if this occurs at a slip 7%. A. 90.5%C. 94.2% B. 89.3%D. 94.5% 6. A pulsating dc has a constant magnitude of 9A for 0.02s and is zero for 0.01s. The cycle is whence repeated. What is the powerful value. A. 9AC....If you want to get a full essay, put it on our website: BestEssayCheap.com

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