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2003 Course Utilization of Electrical Energy

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Total No. of Questions : 12] P1338 [Total No. of Pages :3 [3764] - 202 B.E. (Electrical) UTILIZATION OF ELECTRICAL ENERGY (2003 Course) (403142) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answer 3 questions from Section I and 3 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) Discuss the different methods of electric heating and their relative merits. [8] Explain the various ways in which the temperature in resistance oven can be controlled. [8] OR Q2) a) What are the modern welding techniques? Describe them. [8] b) An insulating material 2 cm thick and 200 cm2 in area is to be heated by dielectric heating. The material has relative permitivity of 5 and power factor of 0.05 power required is 400W and frequency of 40 MHz is to be used. Determine the necessary voltage and the current that will flow through the material. If the voltage were to be limited to 700V, what will be the frequency to get the same loss? [8] Q3) a) What are the various applications of electrolysis? Explain extraction of [8] metals (Take example of any metal). b) Discuss the objective of electroplating and describe any one process for electroplating. [8] OR P.T.O.

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