Answer
ALL Questions
PART
A – (10 x 2 = 20 Marks)
1. What are the factors influencing the selection of
electrical drives?
2. What is meant by load equalization?
3. Define regenerative breaking of induction motor?
4. What is meant by dynamic breaking?
5. Why DC series are motor not started without load?
6. Why is rotor resistance starter only suitable for slip
ring induction motor?
7. How the speed of induction motor is more than its
synchronous speed in static Kramer system?
8. How is the variable armature voltage obtained in
Chopper based Dc motor control?
9. Sketch the speed torque characteristics of an
induction motor for starter voltage control
10. List the
advantage of slip power recovery scheme speed control of AC motor
11. (a) Describe
the various aspects involved in selection of power rating of Electrical drives.
(13)
(OR)
(b)
(i) Derive the expression for heating and cooling curve. (10)
(ii)Draw and explain the block diagram
of electrical drive. (3)
12. (a) (i) Explain the speed torque
characteristics of DC shunt and series motor. (13)
(OR)
(b) What
is regenerative braking? Explain how it is applied in DC Motor. (13)
13. (a) Describe with neat diagram working of
3 point starter for DC shunt motor. (13)
(OR)
(b)Explain DOL, Autotransformer, Star- Delta starter
for AC Motors. (13)
14. (a) i) Explain the operation of
single phase full converter fed separately excited DC Motor drive. (13)
(OR)
(b) Explain first and Fourth quadrant Chopper
control of separately excited motor for continuous conduction. (13)
15. (a)
Describe Kramer slip power recovery system of 3phase induction Motor. (13)
(OR)
(b)
What do you mean by slip power recovery system? Explain any one method of slip
power recovery system.
(13)
PART –C
16. Describe
Scherbius system of 3phase induction
Motor.
(15)
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