GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V(OLD) EXAMINATION - SUMMER 2019
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Subject Code:150906 Date:10/06/2019
Subject Name:Electrical Power Utilization And Traction
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain factors effecting selection of drive [07]
(b) What do you mean by electric drive. Explain advantages of electric drive [07]
Q.2 (a) Explain speed control of dc shunt motor using flux control method [07]
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(b) Explain torque- slip characteristic of three phase induction motor [07]
OR
(b) Explain plugging braking of dc shunt motor [07]
Q.3 (a) Compare AC and DC traction system. [07]
(b) Explain the terms dead weight ,accelerating weight and adhesive weight in a locomotive. Explain the factors affecting specific energy consumption [07]
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OR
Q.3 (a) Explain speed control methods of three phase induction motor [07]
(b) Draw typical speed time curve for main line and derive expression for max speed using trapezoidal speed time curve [07]
Q.4 (a) Explain advantages of electric heating [07]
(b) Explain eddy current heating [07]
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OR
Q.4 (a) Explain types of resistance welding [07]
(b) Explain Ajax Wyatt furnace. [07]
Q.5 (a) Explain laws of illumination [07]
(b) Explain electro deposition and explain factors affecting it. [07]
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OR
Q.5 (a) State and explain faraday’s laws of electrolysis. [07]
(b) Explain the principle of operation of a sodium vapor lamp [07]
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