Exam Details
| Subject | power electronic control of dc drives | |
| Paper | ||
| Exam / Course | computer science and engineering | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | June, 2017 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code B3303
(AUTONOMOUS) M. Tech I Semester Supplementary Examinations, June 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONTROL OF DC DRIVES
(Power Electronics and Electric Drives) Date: 09 June, 2017 AN
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
Each Question carries equal marks
1.
With a neat circuit diagram and relevant waveforms, explain the operation of single phase fully controlled converter separately excited DC drive system, Derive an expression of average current, output voltage. Assume continuous conduction mode.
7M
The speed of separately excited DC motor is controlled by a single phase semi converter, field current is also controlled by single phase semi converter. The AC supply to the armature and field converter is 208V, 60Hz, armature resistance is 0.25Ω, field resistance is 147Ω, motor voltage constant is 0.7032V/rad/s, Load torque is 45 Nm at 1000 rpm. Assuming continuous conduction mode. Determine:
i. Field current
ii. Delay angle of converter in armature circuit
iii. Input power factor of the circuit
7M
2.
Explain the principle and operation of three phase fully controlled rectifier separately excited DC motor drive.
7M
A 220V, 1500rpm, 50A, separately excited DC motor with armature resistance of 0.5Ω is fed from circulating current dual converter with AC source voltage of 165V(Line), determine the converter firing angles for the following operating points:
i. Motor operating at rated torque and 1000rpm
ii. Braking operation at rated torque and rpm
7M
3.
What are the effects of source inductance and load inductance on the output of rectifiers?
7M
Explain the operation of three phase bridge rectifier with RL load and draw the relevant waveforms and deduce the expression for load current.
7M
4.
With the help of necessary equations, explain the control modeling of three phase converter.
7M
Explain the operation of two quadrant converter controlled separately excited DC motor drive with a neat block diagram.
7M
5.
Derive the motor equations of one-quadrant speed-controlled motor-drive for computer simulation.
7M
What is meant by Harmonic Resonance? Explain the Harmonic equivalent circuit of converter with necessary equations.
7M
6.
Discuss the working of a four-quadrant DC chopper fed separately excited DC motor with the help of neat circuit diagram and draw the waveforms in each case.
14M
7.
With necessary block diagram and waveform, explain the PWM controller for speed control of DC motor drive.
7M
Discuss in brief the design of current controller.
7M
8.
Discuss in brief about the state diagrams of speed feedback and speed controller of dynamic simulation of DC motor drive.
7M
Write short notes on:
i. Command current motor
ii. Current controller
7M
Question Paper Code B3303
(AUTONOMOUS) M. Tech I Semester Supplementary Examinations, June 2017
(Regulations: VCE-R15) POWER ELECTRONIC CONTROL OF DC DRIVES
(Power Electronics and Electric Drives) Date: 09 June, 2017 AN
Time: 3 hours
Max Marks: 70
Answer any FIVE Questions
Each Question carries equal marks
1.
With a neat circuit diagram and relevant waveforms, explain the operation of single phase fully controlled converter separately excited DC drive system, Derive an expression of average current, output voltage. Assume continuous conduction mode.
7M
The speed of separately excited DC motor is controlled by a single phase semi converter, field current is also controlled by single phase semi converter. The AC supply to the armature and field converter is 208V, 60Hz, armature resistance is 0.25Ω, field resistance is 147Ω, motor voltage constant is 0.7032V/rad/s, Load torque is 45 Nm at 1000 rpm. Assuming continuous conduction mode. Determine:
i. Field current
ii. Delay angle of converter in armature circuit
iii. Input power factor of the circuit
7M
2.
Explain the principle and operation of three phase fully controlled rectifier separately excited DC motor drive.
7M
A 220V, 1500rpm, 50A, separately excited DC motor with armature resistance of 0.5Ω is fed from circulating current dual converter with AC source voltage of 165V(Line), determine the converter firing angles for the following operating points:
i. Motor operating at rated torque and 1000rpm
ii. Braking operation at rated torque and rpm
7M
3.
What are the effects of source inductance and load inductance on the output of rectifiers?
7M
Explain the operation of three phase bridge rectifier with RL load and draw the relevant waveforms and deduce the expression for load current.
7M
4.
With the help of necessary equations, explain the control modeling of three phase converter.
7M
Explain the operation of two quadrant converter controlled separately excited DC motor drive with a neat block diagram.
7M
5.
Derive the motor equations of one-quadrant speed-controlled motor-drive for computer simulation.
7M
What is meant by Harmonic Resonance? Explain the Harmonic equivalent circuit of converter with necessary equations.
7M
6.
Discuss the working of a four-quadrant DC chopper fed separately excited DC motor with the help of neat circuit diagram and draw the waveforms in each case.
14M
7.
With necessary block diagram and waveform, explain the PWM controller for speed control of DC motor drive.
7M
Discuss in brief the design of current controller.
7M
8.
Discuss in brief about the state diagrams of speed feedback and speed controller of dynamic simulation of DC motor drive.
7M
Write short notes on:
i. Command current motor
ii. Current controller
7M
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