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Gujarat Technological University

This document appears to be an exam for a course on commissioning electrical equipment. It contains 5 questions asking students to explain concepts related to commissioning tests for machines like transformers, circuit breakers, synchronous machines, DC machines, and isolators. The questions cover topics like slip measurements in induction motors, insulation and temperature rise tests, transformer polarization indexes and drying procedures, vector groups and parallel operation of transformers, earth resistance measurements, and various commissioning tests and procedures for electrical equipment.

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Bhavik Prajapati
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36 views1 page

Gujarat Technological University

This document appears to be an exam for a course on commissioning electrical equipment. It contains 5 questions asking students to explain concepts related to commissioning tests for machines like transformers, circuit breakers, synchronous machines, DC machines, and isolators. The questions cover topics like slip measurements in induction motors, insulation and temperature rise tests, transformer polarization indexes and drying procedures, vector groups and parallel operation of transformers, earth resistance measurements, and various commissioning tests and procedures for electrical equipment.

Uploaded by

Bhavik Prajapati
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Seat No.: ________ Enrolment No.

___________

GUJARAT TECHNOLOGICAL UNIVERSITY


BE - SEMESTER–VIII EXAMINATION – SUMMER 2016
Subject Code:180901 Date:10/05/2016
Subject Name:Commissioning of Electrical Equipments
Time:10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) What is slip? Explain different methods for measurements of slip of Induction 07
Motor.
(b) Describe the following tests to be conducted on 3-phase Induction Motor as per 07
IS-325. (1) Insulation resistance (2) High Voltage (3) Temperature rise
Q.2 (a) Explain the procedure of alignment of shaft of electrical machines. 07
(b) Differentiate between type test and routine test. Explain any two routine test of 07
Power transformer with necessary circuit diagram.
OR
(b) Explain tan delta test on power Transformer with help of circuit diagram. 07
Q.3 (a) Explain the significance of Polarization Index Number. Explain drying out 07
Procedure of Power Transformer.
(b) What are the significance of vector groups in parallel operation? Can we 07
connect Dy1 & Dy11 transformer in parallel? Give your reason.
OR
Q.3 (a) Explain the different methods of earth resistance measurement. 07
(b) Explain no load test and mechanical endurance test on circuit breaker. 07
Q.4 (a) State the importance of mechanical balance and magnetic balance in 07
synchronous machine. How mechanical balance is measured?
(b) Explain commissioning steps for synchronous machines 07

OR
Q.4 (a) Explain Hopkinson’s Test of D.C. Machines 07
(b) Explain Murray loop test for ground fault location in underground cable. 07
Q.5 (a) State the possible trouble, causes and remedial actions for outdoor circuit 07
breaker.
(b) Explain charging current making and breaking test of isolator. 07
OR
Q.5 (a) How bar-to-bar test is performed on DC machine? State importance of this test. 07
(b) State the various troubles ,causes and remedies for DC motors. 07

*************

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