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Anna University, Chennai
Department of B.E Electronics and Instrumentation Engineering
Fourth Semester
EI6402 Electrical Machines
November / December 2015 Exam Important Questions
(Regulation 2013)
IndianUniversityQuestionPapers.com Important Questions Collections 2015
Anna University, Chennai
Department of B.E- Electronics and Instrumentation Engineering
B.E / B.TECH DEGREE EXAMINATION Nov / Dec 2015
FOURTH SEMESTER
EI6402 Electrical Machines
(REGULATION 2013)
1. (i) Explain how AC voltage generated is converted to DC voltage in a generator.(6)
(ii) Explain necessity of starter in a DC motor and describe three-point starter with neat sketch (10)
2. (i) Explain the construction and working principle of DC. generator with neat diagram. (10)
(ii) A 10 KW, 220 V, DC 6 pole shunt motor runs at 1000 rpm. Delivering full load. The armature has 534 la connected conductors- Full load core loss is 0.64 KW. The total brush drop is I volt. Determine the flux per ole neglecting shunt current (6)
3. Explain the procedure for obtaining internal and external characteristics of a separately excited
DC generator. (16)
4. Explain with neat diagram the working of 3 point starter (16 marks)
5. Explain the seed control of a DC series motor by (i) field divertors method and (ii) variable
resistance in series with the motor (16)
6. (i) Explain how AC voltage generated is converted to DC voltage in a generator. (6)
(ii) Explain necessity of starter in a DC motor and describe three-aim starter with neat sketch (10)
7. Explain the construction and working principle of switched reluctance motor (16 marks)
8. (i) Write the advantage of stationary armature and rotating field in alternator (5)
(ii) Explain V-curves as applied to synchronom motors. (5)
9. Briefly explain the phenomenon of hunting in a synchronous machine. How is it remedied? (16 marks)
10. Draw and explain the principle of operation of a synchronous motor. Explain the methods of
starting (16)
11. Draw and explain the vector diagram when the alternator is loaded with
l) resistive
2) Inductive
3) capacitive
12. 10 A 3 phase , 1 MVA, l l kv, star connected alternator has resistance of 0.7 ohm per phase and
synchronous reactance of l2 ohm per phase. Determine the % voltage regulation for a load of 600 KW at 0.8 power factor leading and at rated voltage.
13. Explain the following starters used for starting a three phase induction motors:
(i) auto-transformer starter
(ii) star-delta starter.
14. Explain the torque -slip characteristics ofa three phase induction motor.
15. Derive the relationship between
(i) full load torque and maximum torque.
(ii) starting torque and maximum torque.
(iii) different methods of speed control of induction motor.
16. Discuss any two m ads of speed control of three-phase squirrel cage induction motors
17. What are the types of single phase induction motor? Explain any two in detail.
18. Write short notes on (i) shaded pole motor (ii) repulsion motor.
19. Write notes on (i) Hysteresis motor (ii) Universal motor and (iii) cross field theory.
20. Explain about three phase induction motor and its types
Department of B.E Electronics and Instrumentation Engineering
Fourth Semester
EI6402 Electrical Machines
November / December 2015 Exam Important Questions
(Regulation 2013)
IndianUniversityQuestionPapers.com Important Questions Collections 2015
Anna University, Chennai
Department of B.E- Electronics and Instrumentation Engineering
B.E / B.TECH DEGREE EXAMINATION Nov / Dec 2015
FOURTH SEMESTER
EI6402 Electrical Machines
(REGULATION 2013)
1. (i) Explain how AC voltage generated is converted to DC voltage in a generator.(6)
(ii) Explain necessity of starter in a DC motor and describe three-point starter with neat sketch (10)
2. (i) Explain the construction and working principle of DC. generator with neat diagram. (10)
(ii) A 10 KW, 220 V, DC 6 pole shunt motor runs at 1000 rpm. Delivering full load. The armature has 534 la connected conductors- Full load core loss is 0.64 KW. The total brush drop is I volt. Determine the flux per ole neglecting shunt current (6)
3. Explain the procedure for obtaining internal and external characteristics of a separately excited
DC generator. (16)
4. Explain with neat diagram the working of 3 point starter (16 marks)
5. Explain the seed control of a DC series motor by (i) field divertors method and (ii) variable
resistance in series with the motor (16)
6. (i) Explain how AC voltage generated is converted to DC voltage in a generator. (6)
(ii) Explain necessity of starter in a DC motor and describe three-aim starter with neat sketch (10)
7. Explain the construction and working principle of switched reluctance motor (16 marks)
8. (i) Write the advantage of stationary armature and rotating field in alternator (5)
(ii) Explain V-curves as applied to synchronom motors. (5)
9. Briefly explain the phenomenon of hunting in a synchronous machine. How is it remedied? (16 marks)
10. Draw and explain the principle of operation of a synchronous motor. Explain the methods of
starting (16)
11. Draw and explain the vector diagram when the alternator is loaded with
l) resistive
2) Inductive
3) capacitive
12. 10 A 3 phase , 1 MVA, l l kv, star connected alternator has resistance of 0.7 ohm per phase and
synchronous reactance of l2 ohm per phase. Determine the % voltage regulation for a load of 600 KW at 0.8 power factor leading and at rated voltage.
13. Explain the following starters used for starting a three phase induction motors:
(i) auto-transformer starter
(ii) star-delta starter.
14. Explain the torque -slip characteristics ofa three phase induction motor.
15. Derive the relationship between
(i) full load torque and maximum torque.
(ii) starting torque and maximum torque.
(iii) different methods of speed control of induction motor.
16. Discuss any two m ads of speed control of three-phase squirrel cage induction motors
17. What are the types of single phase induction motor? Explain any two in detail.
18. Write short notes on (i) shaded pole motor (ii) repulsion motor.
19. Write notes on (i) Hysteresis motor (ii) Universal motor and (iii) cross field theory.
20. Explain about three phase induction motor and its types
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