Wednesday, October 29, 2014

B.E EEE Nov Dec 2011 Question Paper: EE52 Electrical Machines - II Fifth Semester Anna University of Technology, Coimbatore

ANNA UNIVERSITY OF TECHNOLOGY, COIMBATORE

B.E./B.Tech. DEGREE EXAMINATION, November/December 2011

FIFTH SEMESTER - EEE

ELECTRICAL MACHINES II

Time : Three hours Maximum : 100 Marks

Answer ALL Questions

PART A - (10 X 2 = 20 Marks)

1. Why altemators are rated in kVA not in kW?

2. Why short pitch windings are preferred over full pitched winding?

3. What are the causes of changes in voltage of altemators when loaded?

4. What does hunting of synchronous motor mean?

5. Define slip of an induction motor.

6. What is induction generator?

7. Is it possible to add an external resistance in the rotor circuit of a cage induction motor? Justify your answer.

8. Mention the methods to change the speed of an induction motor.

9. Why the single‘phase induction motors are not self Starting one?

10. Mention the applications of stepper motor.

PART- B (5 X 16 = 80 MARKS)

11. a. Explain the construction and working principle of synchronous machines in detail (8)

b. The open circuit and short circuit test readings for a 3-phase star connected 1000 kVA, 2000V, 50 Hz synchronous generators are.....

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