080120045 Mechatronics May June AU Coimbatore 2014 Question Paper

080120045 Mechatronics Anna University Coimbatore 7th Semester BE Mechanical Engineering Regulation 2008 Question Paper Asked in May June 2014:

Anna University, Coimbatore

Question Paper Code: 11050

B.E Degree Examination May June 2014

Seventh Semester

080120045 Mechatronics

Department of Mechanical Engineering

(Regulation 2008)

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.....

Question Paper of Anna University of Technology, Coimbatore, 080280039 Electrical Machines - II Fifth Semester B.E EEE Nov Dec 2010

Anna University of Technology, Coimbatore

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

Regulations 2008

Fifth Semester - EEE

080280039 '- Electrical Machines - II

Time : 3 hours - Max. Marks : 100

Part - A (20 x 2 = 40 marks)

Answer all Questions

1. What are the conditions to be satisfied for the proper synchronization of alternators?

2. Write down the equation for frequency of emf induced in an alternator.

3. What is meant by synchronous impedance of an alternator?

4. Define the term voltage regulation of an alternator.

5. How a DC generator. can be converted in to an alternator?

6. Mention different power stages in a synchronous motor.

7. Write the various torques associated with a synchronous motor.

8. What is hunting? 

9. Write the applications of synchronous motor.

ll). Mention the advantages of skewed rotor slots?

11. Define the term slip.

12. List the available methods for measurement of slip of an induction motor?

13. List the different methods of which speed control of induction motor is achieved.

14. What is crawling?

15. What could be reasons for very slow running of split phase motor?

16. Mention the two types of unexcited single-phase synchronous motor? 

17. A slip-ring induction motor runs at 290 rpm at full load when connected to 50 HZ supply. Determine the number of poles and slip. Assume Ns = 300 rpm.

18, How would you reverse the direction of rotation of a capacitor start-induction run motor?

19. Define the term step angle in stepper motor.

20. Mention the application of switched reluctance motor.

Part B carrying 60 marks in total, will be available in the following images. Download the images and share it with friends.