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GUJARAT TECHNOLOGICAL UNIVERSITY
- SEMESTER-VI(OLD) - EXAMINATION - SUMMER 2019
Subject Code:160901 Date:27/05/2019
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Subject Name: Electrical Machine - I11
Time:10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
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3. Figures to the right indicate full marks.
Q.1 (a) Describe the Hopkinson’s test to find efficiency of DC machines. 07
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(b) Define distribution factor and derive its equation. 07Q.2 (a) Explain V and inverted V curve of synchronous motor. 07
(b) Explain field’s test for finding the efficiency of DC series machine. 07
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OR
(b) Define pitch factor and derive its equation. Also give its advantage and
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disadvantage. 07Q.3 (a) State the condition of synchronizing of an alternator with bus bar. Explain one dark
and two bright lamp methods with necessary electrical circuit diagram. 07
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(b) What do you mean by SCR (short circuit ratio) of a synchronous machine? What is
its significance? 07
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OR
Q.3 (a) Explain armature reaction and its effects at different power factor in alternator. 07
(b) Why synchronous motor is not self-starting? Explain the methods of starting of
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synchronous motor. 07
Q.4 (a) Define voltage regulation of alternator and explain ZPF method. 07
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(b) Write a short note on auto synchronous motor. 07OR
Q.4 (a) Write short note on DC servo motor. 07
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(b) Explain hunting of synchronous machine and method of its prevention. 07
Q.5 (a) Explain the operation of AC servomotor. 07
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(b) Write a short note on Switched Reluctance Motor. 07OR
Q.5 (a) Explain working of PMBLDC motor with schematic diagram. 07
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(b) Explain the construction and working of an induction regulator. 07
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