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2003 Course Basic Electrical Eng.

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Total No. of Questions : 12] [Total No. of Printed Pages : 5 [3661]-14 F. E. Examination - 2009 BASIC ELECTRICAL ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions : (1) Answers to the two sections should be written in separate answer-books. (2) Black figures to the right indicate full marks. (3) Neat diagrams must be drawn wherever necessary. (4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam table is allowed. (5) Assume suitable data, if any. SECTION - I Q.1) (A) Explain the effect of temperature on conducting and insulating material with graph. [06] (B) Compare Lead Acid Cell and Nickel Cadmium Cell. [06] (C) An electric kettle containing 0.75 liters of water raises the temperature from 30oC to 100oC using 0.5kW of power from a 240V D.C. supply. If overall efficiency of the kettle is 80%, estimate the time required for operation. Assume specific heat of water = 4200 J/kg.ok. [06] OR Q.2) (A) What is Insulation Resistance ? Derive the expression for insulation resistance of a cable. [06] (B) Determine the current flowing at the instant of switching a 100 watt lamp on 230V supply. The ambient temperature is 25oC. The filament temperature is 2000oC and the resistance temperature coefficient is 0.005/oC at 0oC. [06] (C) What are the factors governing the Value of Resistance ? Explain the term Resistivity. [3661]-14 1 [06] P.T.O.

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