GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (OLD) EXAMINATION - SUMMER 2019
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Subject Code: 180901 Date: 15/05/2019
Subject Name: Commissioning of Electrical Equipments
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define Routine test & Type test. List out the different types of routine test performed on power transformer. [07]
(b) Explain polarity test of 3-phase transformer. [07]
Q.2 (a) Define polarization index number. Which information is available from it? [07]
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(b) Explain the drying out procedure of static machine. [07]OR
(b) Explain the mechanical endurance test performed on circuit breaker. [07]
Q.3 (a) List out the different types of test performed on D.C. Machine to know the performance of it. Explain any Swinburne’s test. [07]
(b) Explain the speed control methods of 3-phase induction motor. [07]
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OR
Q.3 (a) Explain the High voltage test of power transformer. [07]
(b) Explain the test for measurement of insulation resistance of 3-phase power transformer. [07]
Q.4 (a) Explain Hopkinson’s test of d.c. machine [07]
(b) Explain the temperature rise test of 3-phase induction motor. [07]
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OR
Q.4 (a) Explain the different methods to measure the earth resistance. [07]
(b) State the conditions of parallel operation of two alternators. Explain the dark lamp method with circuit diagram. [07]
Q.5 (a) Explain different methods of cooling of power transformer. [07]
(b) Explain the Murry-Loop Test for the location of cable fault. [07]
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OR
Q.5 (a) Define slip of an induction motor. Explain the different methods to measure the slip of an induction motor. [07]
(b) Define burden-of a CT. Explain how polarity test is carried out on CT? [07]
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