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2003 Course Utilization of Electrical Energy

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 222 P 1060 B.E. (Electrical) UTILIZATION OF ELECTRICAL ENERGY (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 03 questions from Section I and 03 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) What are the factors which decide the frequency and voltage of dielectric heating? Derive an expression for the heat produced in a dielectric material. [8] Describe the construction and working of Ajax Wyatt induction type furnace. [8] OR Q2) a) b) Discuss the methods of temperature control of resistance ovens. [8] The power required for dielectric heating of a slab of resin 150 cm2 in area and 2 cm thick is 200 watts. Frequency of 30 MHz. The material has a relative permitivity of 5 and pf. 0.05. Determine the voltage necessary and current flowing through the material. If the voltage is limited to 600 V, what will be the value of the frequency to obtain the same heating. [8] Q3) a) b) Explain briefly extraction and refining of metals by electrolysis. [8] What is electro deposition & explain in detail various factors which have effect on the appearance and quality of the deposited surface. [8] OR P.T.O.

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