Exam Details
| Subject | power electronic control of ac drives | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | June, 2017 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code B3307
(AUTONOMOUS) M.Tech II Semester End Semester Regular Examinations, June 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONTROL OF AC DRIVES
(Power Electronics and Electric Drives) Date: 07 June, 2017 FN
Time: 3 hours
Max Marks: 70
Answer any Five Questions.
All Questions carries equal marks.
1.
Derive an equation relating the speed and torque of an induction motor and thereby draw its speed-torque characteristics.
7M
Explain variable frequency control of induction motors. Also draw the induction motor characteristics during variable frequency operation.
7M
2.
Discuss the operation of induction motor employing open-loop V/f speed control with voltage fed inverter.
7M
With appropriate diagrams, explain the functioning of current fed inverter drive with speed and flux control.
7M
3.
While employing static Kramer's driver, the line power factor is poor due the phase controlled inverter. Suggest and explain a suitable scheme to overcome this issue.
8M
Briefly discuss the operation of static Scheribus drive.
6M
4.
Using the dc motor analogy, explain the fundamentals of vector control methods.
7M
Write short notes on self-tuning control.
7M
5.
Draw the speed-torque characteristics of synchronous motors after deriving an expression relating speed and torque.
7M
With reference to the control of synchronous motors, briefly explain Unity power factor control.
7M
6.
Briefly explain:
i. Constant torque mode controller
ii. Field weakening controller
14M
7.
Explain the operation of current controlled variable reluctance drives.
7M
Draw the constructional diagram of variable reluctance motor and describe the constructional features.
7M
8.
Discuss about the use of brushless dc motor drives for servo applications with relevant diagrams.
7M
Describe the construction of BLDC motors with a neat diagram.
7M
Question Paper Code B3307
(AUTONOMOUS) M.Tech II Semester End Semester Regular Examinations, June 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONTROL OF AC DRIVES
(Power Electronics and Electric Drives) Date: 07 June, 2017 FN
Time: 3 hours
Max Marks: 70
Answer any Five Questions.
All Questions carries equal marks.
1.
Derive an equation relating the speed and torque of an induction motor and thereby draw its speed-torque characteristics.
7M
Explain variable frequency control of induction motors. Also draw the induction motor characteristics during variable frequency operation.
7M
2.
Discuss the operation of induction motor employing open-loop V/f speed control with voltage fed inverter.
7M
With appropriate diagrams, explain the functioning of current fed inverter drive with speed and flux control.
7M
3.
While employing static Kramer's driver, the line power factor is poor due the phase controlled inverter. Suggest and explain a suitable scheme to overcome this issue.
8M
Briefly discuss the operation of static Scheribus drive.
6M
4.
Using the dc motor analogy, explain the fundamentals of vector control methods.
7M
Write short notes on self-tuning control.
7M
5.
Draw the speed-torque characteristics of synchronous motors after deriving an expression relating speed and torque.
7M
With reference to the control of synchronous motors, briefly explain Unity power factor control.
7M
6.
Briefly explain:
i. Constant torque mode controller
ii. Field weakening controller
14M
7.
Explain the operation of current controlled variable reluctance drives.
7M
Draw the constructional diagram of variable reluctance motor and describe the constructional features.
7M
8.
Discuss about the use of brushless dc motor drives for servo applications with relevant diagrams.
7M
Describe the construction of BLDC motors with a neat diagram.
7M
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