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2003 Course Utilization of Electrical Energy

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Total No. of Questions : 12] P982 [Total No. of Pages : 3 [3664]-179 B.E. (Electrical) UTILIZATION OF ELECTRICAL ENERGY (2003 Course) 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) What are different methods of electric heating? Describe briefly the methods of direct and indirect resistance heating. List the application of these two methods. [8] Name and describe various resistance welding processes. [8] OR Q2) a) b) Q3) a) b) Discuss advantages of electrically produced heat. State the properties of a heating element that you will look for. [8] A 15 kW, 220 V, single phase resistance oven employs nickelchrome wire for its heating elements. It the wire temperature is not to exceed 1000 C and the temperature of the charge is to be 600 C. Calculate the diameter and length of the wire. Assume radiating efficiency to be 0.6 and emissivity as 0.9. For Nickel chrome resistivity is 1.016 10-6 -m. [8] Describe the process of extraction of metals. Explain how zinc and aluminium are extracted from their ores. [8] What is electroplating and what for is it done? Describe the various operations involved in electroplating. [8] P.T.O.

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