Exam Details
| Subject | special electrical machines | |
| Paper | ||
| Exam / Course | b.e(electrical and electronics engineering) | |
| Department | ||
| Organization | SETHU INSTITUTE OF TECHNOLOGY | |
| Position | ||
| Exam Date | May, 2017 | |
| City, State | tamil nadu, pulloor |
Question Paper
Reg. No.
B.E. B.Tech. DEGREE EXAMINATION, MAY 2017
Seventh Semester
Electrical and Electronics Engineering
01UEE703 SPECIAL ELECTRICAL MACHINES
(Regulation 2013)
Duration: Three hours Maximum: 100 Marks
Answer ALL Questions
PART A (10 x 2 20 Marks)
1. What is saliency ratio of Synchronous Reluctance Motors?
2. State the advantages of synchronous reluctance motor.
3. List the classifications of Stepper motors.
4. How will you define Step angle? 5. What are advantages of Switched Reluctance Motors?
6. State about aligned an unaligned inductance and its effect in SRM. 7. Why rotor position sensors are needed in PMBLDC motor? 8. What are the applications of BLDC Motors?
9. What are the features of PMSM?
10. Why PMSM operating in self-controlled mode is known commutatorless dc motor?
Question Paper Code: 31373
2
31373
PART B x 16 80 Marks)
11. Describe the axial and radial type rotor of synchronous reluctance motor.
Or
Draw and make clear the phasor diagram of synchronous reluctance motor.
12. Enlighten the various modes of excitation of VR stepping motor with excitation table.
Or
With a neat sketch, explain the dynamic characteristics of stepper motor.
Derive the expression for torque production in VR stepper motor.
13. Explicate the constructional feature and principle of operation of switched reluctance motor.
Or
What are the basic requirements of power controller in switched reluctance motor? Explain the C-dump power controller circuit for Switched Reluctance Motor.
14. Explain construction and working principle of PMBLDC motor.
Or
Give the difference between mechanical and electronic commutator.
Derive the expression for EMF and Torque equations of a PMBLDC.
15. Explicate with Phasor diagram of PM synchronous Motor.
Draw and give explanation about the speed torque characteristics of PM synchronous motor.
Or
Explain microprocessor based control of PM synchronous motor.
B.E. B.Tech. DEGREE EXAMINATION, MAY 2017
Seventh Semester
Electrical and Electronics Engineering
01UEE703 SPECIAL ELECTRICAL MACHINES
(Regulation 2013)
Duration: Three hours Maximum: 100 Marks
Answer ALL Questions
PART A (10 x 2 20 Marks)
1. What is saliency ratio of Synchronous Reluctance Motors?
2. State the advantages of synchronous reluctance motor.
3. List the classifications of Stepper motors.
4. How will you define Step angle? 5. What are advantages of Switched Reluctance Motors?
6. State about aligned an unaligned inductance and its effect in SRM. 7. Why rotor position sensors are needed in PMBLDC motor? 8. What are the applications of BLDC Motors?
9. What are the features of PMSM?
10. Why PMSM operating in self-controlled mode is known commutatorless dc motor?
Question Paper Code: 31373
2
31373
PART B x 16 80 Marks)
11. Describe the axial and radial type rotor of synchronous reluctance motor.
Or
Draw and make clear the phasor diagram of synchronous reluctance motor.
12. Enlighten the various modes of excitation of VR stepping motor with excitation table.
Or
With a neat sketch, explain the dynamic characteristics of stepper motor.
Derive the expression for torque production in VR stepper motor.
13. Explicate the constructional feature and principle of operation of switched reluctance motor.
Or
What are the basic requirements of power controller in switched reluctance motor? Explain the C-dump power controller circuit for Switched Reluctance Motor.
14. Explain construction and working principle of PMBLDC motor.
Or
Give the difference between mechanical and electronic commutator.
Derive the expression for EMF and Torque equations of a PMBLDC.
15. Explicate with Phasor diagram of PM synchronous Motor.
Draw and give explanation about the speed torque characteristics of PM synchronous motor.
Or
Explain microprocessor based control of PM synchronous motor.
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