Subject Code: 130904
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-III (OLD) EXAMINATION — WINTER 2018
Date: 05/12/2018
Subject Name: Electrical Machines-I
Time: 10:30 AM TO 01:00 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Explain construction of dc machine (07)
(b) Explain torque-slip characteristics of three phase induction motor (07)
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Q.2 (a) Explain the voltage build up process of dc shunt generator (07)
(b) Derive armature torque and shaft torque equation of dc motor (07)
OR
(b) State different methods of speed control of dc motor. Explain Ward leonard method (07)
Q.3 (a) Explain three point starter (07)
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(b) Explain working principle of three phase induction motor (07)
OR
Q.3 (a) Explain various methods of measurement of slip of three phase induction motor (07)
(b) 3-phase ,50-Hz ,8-pole , induction motor has full-load slip of 2%. The rotor resistance and stand still rotor-reactance per phase are 0.001 ohm and 0.005 ohm respectively. Find the ratio of the maximum to full - load torque and the speed at which the maximum torque occurs. (07)
Q.4 (a) Explain working principle of transformer at no load and loaded condition (07)
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(b) Explain autotransformer (07)
OR
Q.4 (a) Discuss the conditions for parallel operation of transformer (07)
(b) Explain open circuit and short circuit test of transformer (07)
Q.5 (a) Explain distribution factor and pitch factor (07)
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(b) Explain synchronous impedance method to determine the voltage regulation of alternator (07)
OR
Q.5 (a) Discuss conditions of parallel operation of synchronous generator (07)
(b) Explain MME method to determine the voltage regulation of alternator (07)
Total Marks: 70
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This download link is referred from the post: GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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