Subject Code: 180901
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VIII (Old) EXAMINATION - WINTER 2019Subject Name: Commissioning Of Electrical Equipments
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain Breakdown voltage (BDV) test of Transformer oil. State properties of Transformer oil. 07
(b) Explain working of Lightning Arrester. Discuss Testing & Commissioning of Lightning Arrester. 07
Q.2 (a) Discuss in detail Murray loop test for locating cable faults. 07
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(b) Explain in brief power frequency voltage withstand test, impulse voltage withstand test & vibration test on bus bar. 07
OR
(b) Explain Mechanical endurance and impulse testing of Circuit breakers. 07
Q.3 (a) What is Earthing? Describe factor affecting Earth Resistance. 07
(b) Explain Hopkinson’s Test of D.C. Machine. 07
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OR
Q.3 (a) State importance voltage drop test. How voltage drop test is performed on DC machine? 02+05
(b) Explain measurement of DC and AC Resistance of Armature and Field winding of synchronous machines. 07
Q.4 (a) Explain Vibration and Noise measurement of synchronous machines. 07
(b) List methods of drying out of electrical equipment. Explain any one method in detail. 02+05
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OR
Q.4 (a) For the following conditions explain in detail troubles, causes and its remedies for 3-¢ squirrel cage induction motor. 07
1) Motor fails to start i) Motor runs at 1/7th synchronous speed. iii) Motor heats up.
(b) Define: ‘slip’ for an Induction motor. Describe in detail method of measurement of slip of an induction Motor. 07
Q.5 (a) Write the significance of Polarization Index Number. Explain drying out procedure of Power Transformer. 07
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(b) Discuss causes of troubles and failure of Transformers and their remedy. 07
OR
Q.5 (a) Differentiate between type test and routine test. Explain any two routine test of Power transformer with circuit diagram. 03+04
(b) Explain the significance of partial discharge measurement and tan delta test in case of transformer? 07
Date: 27/11/2019
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Total Marks: 70
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