Guess
Paper 1st
Branch
Electrical
Code:
306 Electrical Machine 2nd
First question is compulsory and
attempt any 5 questions in rest off.
Q: 1 give the answer of
following:
2*5=10
A: what is the slip in induction motor?
B: why alternator is rated in KVA?
C:
what is the pitch factor?
D: explain synchronous reactance?
E: Why no load current is large in
Induction motor from Transformer?
Q: 2 (A) Explain construction of
slip ring and squirrel cage induction motor with clean diagram? 2*6=12
(B) Explain torque slip characteristics
of induction motor?
Q: 3 (A) Explain Construction,
working principle and characteristics of capacitor start induction motor?
(B) Explain Double revolving field
theory?
2*6=12
Q: 4 (A) Explain Effect of
variation in excitation and prime mover power on the performance of
parallel connected alternators? 2*6=12
(B) Explain Synchronous motor operation at
Constant input power and variable excitation ?
Q: 5 (A) Comparison of induction
motor and synchronous motor? 2*6=12
(B) Drive Swing equation and swing
curve?
Q: 6 (A) Explain Transient
behavior of synchronous machine?
2*6=12
(B) Explain Basic principles,
operation, characteristics and applications of Stepper motor?
Q: 7 (A) Explain Parallel
operation of three phase alternators?
2*6=12
(B) Explain V - curves and inverted V-
curves of synchronous machine?
Q: 8 give short notes of any 3: 3*4=12
a. Synchronous condenser
b. Cogging and crawling
c. Double cage induction motor
d. M and H constants
e. Hunting phenomenon in synchronous
machines
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