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Posted By: ankit narang Member Level: Diamond Posted Date: 01 Aug 2008
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2007 Visvesvaraya Technological University B.E BASIC ELECTRICAL ENGINEERING Question paper
06 ELE 15/25 - BASIC ELECTRICAL ENGINEERING
(Answer any 5 questions by selecting at least two questions from each part.)
PART – A
1a) Show that the equivalent resistance of two resistors connected in parallel is the ratio of the
product of those two resistances divided by the sum of those two resistance values. 4
b) Explain the Fleming’s rules as applied to the production of EMF and Torque. 8
c) Problem on electro – magnetism / D.C. circuits. 8
2a) With usual notations show that the average power consumed by a pure capacitor is zero. 6
b) With reference to an a.c circuit, differentiate between
i) Phase and Phase difference, ii) Reactance and Impedance,
iii) lag and lead power factors. 6
c) Problem on single phase a.c circuit. 8
3a) Obtain the relationship between the line and phase quantities of balanced Star or
Delta loads. 8
b) In the course of measurement of power in three phase circuits the watt meter
readings are related as follows. Find the power factor when,
i) W1 = W2, ii) W1 = 2W2, iii) W1 = 0. 6
c) Problem on three phase circuit. 6
4a) With a neat sketch explain the working of a single phase energy meter 8
b) Write a brief note on fuse. 4
c) Explain what is Earthing and with a neat sketch explain the plate Earthing 8
` PART – B
5a) With usual notation derive an expression for the induced E.M.F of a D.C. machine 6
b) Draw the typical Speed - load characteristics of a D.C. series motor and comment on
its shape. Mention its practical applications. 6
c) Problem on D.C. Generator or D.C. Motor. 8
6a) With usual notations derive an expression for the induced EMF in a single phase
Transformer and define the term transformation ratio. 8
b) List out the various losses in a transformer and explain how they vary with load and
how they are minimized. 6
c) Problem on transformer. 6
7a) Explain the Salient and Non Salient pole generators and where they are preferred. 6
*b) List out the various losses in an ac generator and how its efficiency is estimated. 6
c) Problem on alternator. 8
8a) Define the term ‘slip’ in an Induction motor and explain its importance. 6
b) Explain the necessity of a starter for an Induction motor. 4
c) Problem on Induction motor. 10
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