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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII(NEW) EXAMINATION - SUMMER 2019
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Subject Code:2180901Subject Name:Testing and Commissioning of Electrical Equipments
Time:10:30 AM TO 01:00 PM
Date:17/05/2019
Total Marks: 70
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Q.1 (a) List the factor affecting earth resistance. MARKS 03
(b) List the methods of slip measurement in induction motor. Briefly explain slip measurement by rotor frequency. MARKS 04
(c) For below listed troubles in power transformer, state its causes and remedies: 1) Internal short circuit 2) Overheating 3) Rapid deterioration of oil MARKS 07
Q.2 (a) State the purpose of the following tests: Type tests, Routine tests, Special tests, Development tests MARKS 03
(b) Before installation of the machine what general checkups needs to be performed? MARKS 04
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(c) List various methods of neutral grounding. Explain in detail the method of solid grounding with its merits and demerits. MARKS 07
OR
(c) List various methods for earth resistance measurement. Explain fall of potential method for measurement of earth resistance. MARKS 07
Q.3 (a) What is polarization index? What is its significance? MARKS 03
(b) Explain the drying out procedure of power transformer with necessary graph. MARKS 04
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(c) State the purpose of high voltage testing of power transformer. Describe test set up for impulse testing of power transformer. MARKS 07
OR
(c) Explain the polarity of windings. MARKS 07
Q.4 (a) What are the causes of low value of insulation resistance in the power transformer? How insulation resistance can be brought to required level? MARKS 03
(b) Draw DY1 & DY11 type transformer connections & state feasibility of connecting them in parallel with reason. MARKS 04
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(c) Explain the cause of noise produced by the rotating machine. MARKS 07
Q.5 (a) For the following troubles with slip ring induction motor, state its possible causes: 1) Motor runs slow 2) Motor fails to start MARKS 03
(b) Explain the no load test and blocked rotor test of an induction motor. What data such test provides? MARKS 04
OR
(b) Enlist different tests to be performed on busbar. MARKS 04
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(c) Explain any one test to be performed on three phase synchronous machine to find out its synchronous impedance. MARKS 07
Q.5 (a) Define the making and breaking rating of the circuit breaker. MARKS 03
(b) Explain mechanical endurance test on circuit breaker. MARKS 04
(c) Explain the working of ELCB? What are the different tests performed on it? MARKS 07
OR
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Q.5 (a) Discuss the need for gas insulated substation. MARKS 03
(b) Discuss different cooling system of rotating electrical machines in brief. MARKS 04
(c) Explain Murray loop test for ground fault location in underground cable. MARKS 07
(c) What is degree of protection? How it is designated? What is IP and IC code? MARKS 07
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