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

ANNA UNIVERSITY OF TECHNOLOGY, TIRUNELVELI

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

FIFTH SEMESTER - EEE

ELECTRICAL MACHINES 11

Time : Three hours MaXimum i 100 Marks

Answer ALL Questions

PART A - (10 X 2 = 20 Marks)

1. What do you mean by synchronous reactance?

2. What is the purpose of conducting slip test?

3. Is synchronous motor inherently self-starting or not.

4. State any two methods of starting synchronous motor.

5. What are the losses produced in induction motor?

6. Write down the equation for running torque of an induction motor.

7. Why induction motor draws large current from the supply during starting?

8. How many speeds you can obtain by cascaded connection of induction motors?

9. Why is the single phase induction motor having two winding in this stator?

10. State any two applications capacitor start run induction motor.

PART-B (5 X 16 = 80 MARKS)

11. a. 1) Explain the effects of armature reaction for different power factor loads. (8)

Anna University of Technology, Tirunelveli, EE52 Electrical Machines - II Fifth Semester B.E EEE Nov Dec 2010 Question Paper

Anna University of Technology, Tirunelveli

B.E/B.Tech Degree Examinations Nov/Dec 2010

Fifth Semester

Electrical and Electronics Engineering

EE 52 - Electrical Machines - II

(Regulations 2008)

Time :3 hours - Max.marks : 100

I Answer all Questions

Part - A (10 x 2 = 20 marks)

1, Define the voltage regulation.

2, What is synchronizing torque?

3. Why synchronous motor is not self starting?

4. ' Draw the power angle curve of synchronous motor.

5. . Mention the advantages of double gauge induction motor.

6. List the various factors governing the starting torque of an induction motor.

7. What is the effect of increase in rotor resistance on starting torque of slip ring induction motor?

8. Draw the slip and torque characteristics of slip ring induction motor.

9. State the applications of induction generator. I

10. Mention the working principle of hysteresis motor.

More questions on part B can be had at the following images