Exam Details
| Subject | special electrical machines | |
| Paper | ||
| Exam / Course | electronics and communication engineering | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS)
B. Tech VI Semester Regular Examinations, May 2018
(Regulations: VCE-R15)
SPECIAL ELECTRICAL MACHINES
(Electrical and Electronics Engineering)
Date: 24 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Explain With a neat diagram the essential features of a Rosenberg generator. Describe its application.
9M
Discuss principle, operation and characteristics of amplidyne.
6M
2.
With a neat sketch explain the working of:
i. Series booster
ii. Dynamotor
10M
What is three wire d.c generator and where it is used?
5M
Unit II
3.
Bring out the essential conditions for the satisfactory operation of a 2-phase hybrid step motor.
5M
Explain with neat connection diagram and switching curves, the principle of operation of slow speed synchronous motor for servo control.
10M
4.
With a neat sketch explain the construction of 3-phase, 2-pole synchronous motor with wound or permanent magnet rotor used as a step. Explain its working principle when phase B and C are energized.
15M
Unit III
5.
Draw the cross-sectional view of single stack VR stepping motor with following details:
2-pole, 3-phase, salient pole stator and 4 rotor teeth. (Step angle 300 in ccw direction.)
7M
Discuss the open loop control of 3-phase VR step motor with neat figures.
8M
6.
Explain the construction details of a multiple stack VR motor.
8M
What is a discriminator or rotor position sensor? Explain how it can be used for sensing the position of rotor with neat figures.
7M
Unit IV
7.
Draw the block diagram representing open loop control system using a step motor in a numerically controlled machine tool and explain.
7M
Derive the toque developed in the step motor with air-gap g1 and g2.
8M
8.
With a neat sketch explain construction of a 5-phase hybrid stepping motor. Also with suitable sketches, explain the working principle of the motor, when:
i. Phase A is energized
ii. When Phase B is energized
15M
Unit V
9.
Discuss the factors to be satisfied for the successful operation of an SRM.
8M
Draw idealized profile of an SRM.
7M
10.
Discuss the parameters to be considered for the design of rotor and stator pole arcs.
9M
Explain the operation of rotor sensing with logic controllers.
6M
(AUTONOMOUS)
B. Tech VI Semester Regular Examinations, May 2018
(Regulations: VCE-R15)
SPECIAL ELECTRICAL MACHINES
(Electrical and Electronics Engineering)
Date: 24 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Explain With a neat diagram the essential features of a Rosenberg generator. Describe its application.
9M
Discuss principle, operation and characteristics of amplidyne.
6M
2.
With a neat sketch explain the working of:
i. Series booster
ii. Dynamotor
10M
What is three wire d.c generator and where it is used?
5M
Unit II
3.
Bring out the essential conditions for the satisfactory operation of a 2-phase hybrid step motor.
5M
Explain with neat connection diagram and switching curves, the principle of operation of slow speed synchronous motor for servo control.
10M
4.
With a neat sketch explain the construction of 3-phase, 2-pole synchronous motor with wound or permanent magnet rotor used as a step. Explain its working principle when phase B and C are energized.
15M
Unit III
5.
Draw the cross-sectional view of single stack VR stepping motor with following details:
2-pole, 3-phase, salient pole stator and 4 rotor teeth. (Step angle 300 in ccw direction.)
7M
Discuss the open loop control of 3-phase VR step motor with neat figures.
8M
6.
Explain the construction details of a multiple stack VR motor.
8M
What is a discriminator or rotor position sensor? Explain how it can be used for sensing the position of rotor with neat figures.
7M
Unit IV
7.
Draw the block diagram representing open loop control system using a step motor in a numerically controlled machine tool and explain.
7M
Derive the toque developed in the step motor with air-gap g1 and g2.
8M
8.
With a neat sketch explain construction of a 5-phase hybrid stepping motor. Also with suitable sketches, explain the working principle of the motor, when:
i. Phase A is energized
ii. When Phase B is energized
15M
Unit V
9.
Discuss the factors to be satisfied for the successful operation of an SRM.
8M
Draw idealized profile of an SRM.
7M
10.
Discuss the parameters to be considered for the design of rotor and stator pole arcs.
9M
Explain the operation of rotor sensing with logic controllers.
6M
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