Mahatma Gandhi University (MGU) 2005 B.Tech Electrical and Electronics Engineering Electrical Machines - III (E) - university paper

B.TECH. DEGREE exam
Seventh Semester
Branch : Electrical and Electronics Engineering
ELECTRICAL MACHINES – III(E)
Model for November 2005

Time : 3 Hours Maximum : 100 Marks

PART A
ans all ques..
every ques. carry equal marks.

1. Develop the torque formula for the 3-phase induction motor.
2. Develop the equivalent circuit of a 3-phase induction motor.
3. Explain the necessity of starter for starting a 3-phase induction motor.
4. With the help of a neat sketch, define the star delta method of starting of a 3-phase squirrel cage induction motor.
5. Discuss briefly the operation of an induction generator.
6. Explain the operation of a capacitor start-capacitor run single phase induction motor.
7. Write notes on universal motor.
8. Discuss the operation and application of a reluctance motor.
9. Describe with the help of diagrams the constructional details and action of a double cage induction motor.
10. Explain the action of scherbius advancer
(10 X four = 40 marks)

PART B
ans all ques..
every ques. carry equal marks.

11. Discuss the constructional details of a 3-phase slip-ring and cage induction motors.
Or
12. (a) discuss how circle diagrams is drawn from no load and blocked rotor test.
(b) Draw the torque-slip characteristic of 3-phase induction motor.

Earning:   Approval pending.