Visvesvaraya Technological University (VTU) 2007 B.E BASIC ELECTRICAL ENGINEERING - exam paper

ans any five ques. by selecting at lowest 2 ques. from every part.)
PART – A
1a) State and discuss Kirchhoff’s laws. 6
b) Prove the relation ranging from the self and mutual inductance 6
c) issue on D.C. circuit/magnetic circuit. 8
2a) describe the RMS and avg. value of a sinusoidal emf wave and find their
expressions. 8
b) describe i) real power, ii) reactive power and iii) apparent power as applied single
Phase a.c circuits. 6
c) issue on single phase a.c. circuit. 6
3a) List out the advantages of 3 phase system compared to single phase systems. 4
b) Show that 2 watt meters are sufficient to measure total power in 3 phase
Balanced circuit . 8
c) issue on 3 phase circuits 8
4a) discuss with a neat sketch the working of dynamometer kind wattmeter. 6
b) With relevant circuit discuss how a lamp can be controlled from 3 various
points and where it is preferred. 6
c) discuss the necessity of Earthing and with a neat sketch any 1 method of
Earthing 8
PART - B
5a) discuss with a neat sketch the constructional features of a D.C. machine
and mention the functions of every part. 8
b) discuss the principle of the production of torque in D.C. motors. 6
c) issue on D.C.Motors or Generators. 6
6a) discuss the principle of operation of a single phase transformer. 4
b) With relevant diagrams distinguish ranging from the core kind and shell kind
transformers 8
c) issue on transformer. 8
7a) Mention the various kinds of synchronous generators and discuss the
construction of every kind with relevant diagram. 8
b) Derive the EMF formula of an alternator. 6
c) issue on alternator. 6
8a) discuss why Induction motors never run at synchronous speed. 6
b) Compare the squirrel cage kind with the slip ring Induction motor and
mention their applications. 8
c) issue on Induction Motor. 6

Earning:   Approval pending.