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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER VIII- EXAMINATION SUMMER 2017
Subject Code: X80901 Date: 27/04/2017
Subject Name: Commissioning of Electrical Equipments
Time: 10.30AM to 01.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

What is neutral grounding? What are the methods of neutral grounding? Explain any one in detail.
07

Explain noise measurement and vibration measurement in case of 3-phase induction motor.
07
Q.2

Explain Field test on DC machine with an appropriate circuit diagram.
07

Explain insulation resistance test on synchronous machine.
07
OR

What are the different methods for finding out cable faults? Explain any one of them.
07
Q.3

Explain the tests before the commissioning of cable.
07

Explain the testing procedure in Swinburne's test. Explain how to check the performance of DC motor from Swinburne's test.
07
OR
Q.3

What is Polarization Index? Explain the significance of P.I.
07

What is the Drying out process? How Drying out process is carried out on electrical equipment?
07
Q.4

State faults, causes and remedies with squirrel cage induction motor.
07

Explain the different methods of slip measurement of induction motor.
07
OR
Q.4

Explain trouble shooting and maintenance of circuit breaker.
07

Explain the commissioning steps and tests for DC machines.
07
Q.5

Discuss the necessary condition of synchronization. Explain the circuit diagram of synchronization of alternator with grid.
07

What is the commissioning of electrical equipment? Explain the classification of different testing.
07
OR
Q.5

Explain variation of voltage and frequency on performance of induction motor.
07

Explain the different methods of earth resistance measurement.
07