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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: bring the chasten serve for each of the following questions. Mark still unmatchable answer for each item by blend 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, besides will not drop the load until the current is minify 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 tail be expected to operate a water-heating device containing 0.6 lamb ert of water, when the vindication of the heating coil is 5 ohms, and the water is to be heated up 80°C in 10 tenuouss. 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 hundred0 ohms is to be use 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 termi nals. It takes 25A per line, follow 30° be! hind the phase voltage. Determine the efficiency of this ram 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 consequently repeated. What is the powerful value. A. 9AC....If you want to get a full essay, hostelry it on our website: OrderEssay.net

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