Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-VIII (OLD) EXAMINATION - WINTER 2020
Subject Code:180901 Date:25/01/2021
Subject Name:Commissioning Of Electrical Equipments
Time:02:00 PM TO 04:00 PM
Instructions:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks
Q.1 (a) Explain the polarity test and voltage ratio test of 3-phase transformer (07)
(b) Explain the polarization Index Number. What is the significance of it and how is it measured? (07)
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Q.2 (a) Explain the purposes for performing no-load and block rotor test of induction motor. (07)
(b) Explain the filtration procedure of transformer oil. (07)
Q.3 (a) List the necessary conditions of synchronization of two alternators. Explain any one method (07)
(b) Explain the Swinburne’s test of dc machine. (07)
Q.4 (a) State the various troubles with commutator-and brush gear. (07)
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(b) Explain Murray Loop test of underground fault in cable. (07)
Q.5 (a) Define slip. Explain the various methods of measurement of slip of induction motor. (07)
(b) Explain Mechanical endurance test of circuit breaker. (07)
Q.6 (a) Explain Hopkinson’s test of dc machine. (07)
(b) Differentiate between routine test and type test. List out the different test of transformer (07)
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Q.7 (a) State the various troubles, causes and remedies of D.C.Motor. (07)
(b) What are the causes of vibrations in rotating machine? How the vibration will be measured? What are the remedies of it.? (07)
Q.8 (a) Explain the different methods of earth resistance measurement. (07)
(b) Explain the Insulation resistance measurement by Megger of transformer. (07)
Total Marks: 56
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