Download GTU B.Tech 2020 Winter 8th Sem 2180901 Testing And Commissioning Of Electrical Equipments Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 2180901 Testing And Commissioning Of Electrical Equipments Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VIII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2180901 Date:28/01/2021
Subject Name:Testing and 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) What is earth resistance? Which are the factors affecting on its?
03

(b) What is different between system earthing and equipment earthing?
04

(c) Explain tan delta test on power transformer with help of circuit diagram.
07


Q.2 (a) Explain basic requirement of foundation.
03

(b) Explain procedure of alignment of shaft of electrical machine.
04

(c) What is insulation resistance? How is it measured for power transformer? 07







Q.3 (a) Explain significant of polarization index.
03

(b) Explain polarity test of transformer.
04

(c) Write a short note on enclosure.
07




Q.4 (a) Draw connection of Dy1 and Yd11 type transformer connection.
03

(b) Explain breakdown voltage (BDV) test of transformer oil.
04

(c) List out commissioning test of power transformer. Explain voltage ratio 07
test with the help of circuit diagram.



Q.5 (a) Explain any two troubles, causes and remedies of DC generator.
03

(b) Explain temperature rise test on rotating electrical machine.
04

(c) Explain maintenance schedule of induction motor.
07



Q.6 (a) Define degree of protection of rotating electrical machine.
03

(b) List out the commissioning test of synchronous machine.
04

(c) Explain trouble, cause and remedies of 3 phase induction motor.
07



Q.7 (a) Enlist different tests to be performed on busbar.
03

(b) Write a short note on gas insulated substation.
04

(c) Explain Murry loop test for ground fault location in underground cable.
07



Q.8 (a) Explain any two trouble, causes and remedial measures of circuit breaker. 03
(b) Explain mechanical endurance test on circuit breaker.
04
(c) Write a short note on location of lighting arrester.
07

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