Download GTU BE/B.Tech 2019 Winter 8th Sem New 2180901 Testing And Commissioning Of Electrical Equipments Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2180901 Testing And Commissioning Of Electrical Equipments Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2180901 Date: 29/11/2019

Subject Name: Testing and Commissioning of Electrical Equipments
Time: 02:30 PM TO 05:00 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) Why the earthing resistance is kept minimum for safety of human being? What
is the effect if earthing resistance is high?
03
(b) Explain three point method for measurement of earthling resistance 04
(c) Which type of test is conducted on electrical equipment during its
manufacturing process?
07
Q.2 (a) What are the steps taken while installation of electrical equipment at site? 03
(b) Which care must be taken when new transformer is dispatched on site from a
factory?
04
(c) Explain how the transformer group DY1 and DY11 is to be tested. 07
OR
(c) Explain step of drying out of big size of transformer. 07
Q.3 (a) Why the shaft alignment is required for switch gear installation and motor
installation?
03
(b) How the winding resistance of transformer is to be measured? 04
(c) How the switching impulse test and high voltage test is conducted by
transformer?
07
OR
Q.3 (a) How the ratio test is conducted on transformer? 03
(b) How the insulation resistance is measured in transformer? 04
(c) Why the tape changer is kept of HV side of transformer? Give your
justification?
07
Q.4 (a) What are reasons for vibration in induction motor? 03
(b) What are the reasons if D.C.motor does not start on giving a rated voltage? 04
(c) What are the different methods for drying of rotating machine? 07

OR
Q.4 (a) How block rotor and open circuit test is conducted on induction motor? Which
parameters can we obtained from this test?
03
(b) How the temperature rise test is conducted on rotating machine? 04
(c) How the PI is measured of rotating machine? What is the significance of it on
performance of rotating machine?
07
Q.5 (a) Which are the tests conducted on circuit breaker? 03
(b) What is the reason if circuit breaker is refused to close if closing signal is given? 04
(c) Explain closing and opening mechanism in circuit breaker 07
OR

Q.5 (a) What is step and touch potential in substation? What is its significance? 03
(b) What is the preferred location of lightning arrester in substation? Give your
justification.
04
(c) Which are different components of sub-station? What are the functions of each
component in sub-station?
07

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