Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 180901 Commissioning Of Electrical Equipments Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
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 Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks
Q.1 (a) Explain the polarity test and voltage ration test of 3-phase transformer
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(b) Explain the polarization Index Number. What is the significance of it and how is
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it measured?
Q.2 (a) Explain the purposes for performing no-load and block rotor test of induction
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motor.
(b) Explain the filtration procedure of transformer oil.
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Q.3 (a) List the necessary conditions of synchronization of two alternators. Explain any
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one method
(b) Explain the Swinburne's test of dc machine.
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Q.4 (a) State the various troubles with commutator and brush gear.
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(b) Explain Murray Loop test of underground fault in cable.
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Q.5 (a) Define slip. Explain the various methods of measurement of slip of induction
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motor.
(b) Explain Mechanical endurance test of circuit breaker.
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Q.6 (a) Explain Hopkinson's test of dc machine.
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(b) Differentiate between routine test and type test. List out the different test of
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transformer
Q.7 (a) State the various troubles, causes and remedies of D.C.Motor.
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(b) What are the causes of vibrations in rotating machine? How the vibration will be
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measured? What are the remedies of it.?
Q.8 (a) Explain the different methods of earth resistance measurement.
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(b) Explain the Insulation resistance measurement by Megger of transformer.
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This post was last modified on 04 March 2021