Anna University Chennai, EE52 Electrical Machines - II Fifth Semester B.E EEE May June 2011 Question Paper

Anna University Chennai

B.E/B.Tech Degree Examinations May / June 2011

Regulations 2008

Fifth Semester - BEE

EE52 - Electrical Machines - II

Electrical and Electronics Engineering

Time : 3 hours  Max. Marks : 100

Part-A (10 x 2=20 marks)

Answer all Questions

1. What are the effects of Armature reactor?

2. State the condition for parallel operations of Alternator.

3. List any two characteristic features of synchronous motor.

4. What is the synchronous condenser?

5. ‘Why is the Induction motor always runs with the speed less than the synchronous speed?

6. Define slip.

7. What is the need for starters in Induction motor?

8. What are the speed control techniques applicable to squirrel cage induction motor?

9. Define double field revolving theory.

10. Write down any two applications of single phase induction motors.

Part B (5 x 16 = 80)

11. a) i. Derive the emf equation of Alternator.  (8)

ii. A motor generator set used for providing variable frequency a.c. supply consists of a three-phase, 10-pole synchronous motor and a 24-pole, three phase synchronous generator. The motor-generator set is fed from a 25 Hz three phase a.c. supply. A 6-pole, three phase induction motor is electrically

connected to the terminals of the synchronous generator and runs at a slip of 5%. Determine:

The frequency of the generated voltage of the synchronous generator.

The speed at Which the induction motor is running. (8)

Remaining questions can be collected from the images provided below.

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