Subject Code: 180801
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VIII (OLD) EXAMINATION - SUMMER 2019
Subject Name: Testing And Installation Of Electrical Equipments And Systems
Time: 10:30 AM TO 01:00 PM
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain the procedure and significance of temperature rise test with necessary figure and its co-relation with rated normal current. [07]
(b) Write any seven causes of disturbance in power quality examine their effect on power quality and write remedies for each disturbance of electric power supply. [07]
Q.2 (a) State the checks to be carried out at site prior to commissioning of electric motors. [07]
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(b) Describe the principle of fiber optic data transmission with necessary figure. [07]
OR
(b) Define briefly the following terms in power cable: [07]
a) Operating capacitance b) charging currents c) reactive power d) leakage currents e) continuous current carrying capacity f) inductance g) effective d.c. resistance.
Q.3 (a) What are the causes of failure of a circuit-breaker? Explain the procedure of failure analysis. [07]
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(b) Explain the working principle of Megger with necessary figure and Procedure of its use. [07]
OR
(a) What is load shedding? Why is it necessary? How is it carried out and where? [07]
(b) Explain the procedure of dryingout of electric motor using the (1) radiating lamp (2) drying chambers and resistor heaters. [07]
Q.4 (a) Describe the purpose, test set-up and procedure of power frequency withstand test on power transformer. [07]
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(b) State and explain the types of constructions of voltage transformers and their applications. [07]
OR
(a) Illustrate the schematic of bipolar 2-terminal HVDC link and define functioning of all parts of it. [07]
(b) Give summary of auxiliary systems in substations and state their functions. [07]
Q.5 (a) Describe the second characteristic numeral in the standard designation of cooling system. [07]
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(b) Prepare the sequence of tripping the main circuit-breaker, unit auxiliary circuit-breaker and field circuit breaker in the generating unit scheme. [07]
OR
(a) Explain the seven principles of safety management in electrical plants. [07]
(b) Describe the test set-up and test procedure of switching impulse test with necessary figure. [07]
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Date: 13/05/2019
Total Marks: 70
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