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Seat No.: Enrolment No.:
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER • EXAMINATION SUMMER 2018
Subject Code: 350901 Date: 01-05-2018
Subject Name: Electrical Installation Maintenance
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.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1

List of safety precaution to be taken while unloading heavy load.
07





Difference between foundation for static machine and rotating machine.
07



Q.2

Define preventive maintenance, write advantage of Preventive maintenance.
07





Explain Overhauling Write the activity performed during overhauling.
07



OR

Write the maintenance schedule of Transformer having capacity below 1000 KVA.
07



Q.3

Explain Dielectric strength test of Insulating Oil.
07





Explain the construction and working of megger.
07



OR
Q.3

Define commissioning, Write electrical test to be performed before commissioning the electrical equipment.
07





Write the tools or equipment required for maintenance of domestic appliance.
07



Q.4

Explain reasons for faults in electrical equipment.
07





Write short note on " Permit to work".
07



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OR
Q.4

Write the properties of good insulating oil and give reason of deterioration of insulating oil.
07





List the method of measuring earth resistance and explain any one .
07



Q.5

Explain Live line maintenance of head transmission line.
07





State the cause of electrical accident and explain any one cause in details.
07



OR
Q.5

Name the different types of fire extinguisher and explain working of any two.
07





List the methods of earthing. Explain any one in detail.
07