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Posted By: tasneem Member Level: Gold Posted Date: 26 Jun 2008
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2008 Anna University B.E Computer Science 1st year annual pattern Question paper
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BE/Btech degree examination , april/may 2008
annual pattern- first year
(regulation 2004)
computer science and engineering
EE1X11- electical engineering
(common to information engineering)
time: three hours
max marks: 100 marks
answer all questions
part A --------(10*2=20 marks)
1. what is meant by electrical energy ?
2. what are the advantages of polyphase system ?
3. state faradays law of electromagnetic induction.
4. what is mutual induction ?
5. list out different types of DC motor.
6. what are the advantages of three phase transformer ?
7.define pitch factor
8. single phase induction motor is not self standing , why?
9. compare open loop and closed loop system .
10. define rise time.
part- b----------(5*16=80)
11.a). use superposition theorem to find the current flowing through the 20 ohm resistance.
or
b). in a series RLC circuit R = 24 ohm, L=191mH, C=100 uF given that the supply voltage is 240V,60 Hz,find
1.equivalent impedance
2.powr factor
3.current
4.power
5.reactive power
12a). write short notes on 1.)parallel magnetic circuits
2.)AC operation of magnetic circuits.
or
b).1.)explain the terms self and mutual inductances.
2.) a coil ha a self inductance of 30 mh. calculate the EMF induced in the coil when the current flowing through it is 1. increased at the rate of 200A/sec.
2.raises from 0 to 10 A in 0.06 seconds.
13a). derive the equivalent circui of a sinc\gle phase transformer and show how it is useful in analysis of te performence of a transformer.
or
b).discuss the function and constructional detail of 1. commutator,2. brush assembly, 3.interpoles.
14a). explain the various methods of starting the 3 phase induction motor.
or
b).discuss various methods of starting of single phase induction motor.
15a).explain the working principle of a 2-phase AC servomotor.discuss its transfer function.
or
b).derive the transfer function of a seperatedly exited DC generator at no load condition.
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