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SPPU Electrical Engineering (Semester 5)
Electrical Installation, Maintenance and Testing
December 2016
Electrical Installation, Maintenance and Testing
December 2016
Solve any one question from Q.1(a,b,c) & Q.2(a,b,c)
1(a)
What is meant by condition based maitenance?
6 M
1(b)
Explain failure modes of transformer.
7 M
1(c)
Which parameters of induction motors are considered for condition monitoring?
7 M
2(a)
Explain insulation deterioration.
6 M
2(b)
Write the IS specifications for testing of transformer oil.
6 M
2(c)
Explain fault diagnostic methods of induction motor.
8 M
Solve any one question from Q.3(a,b) & Q.4(a,b)
3(a)
Describe the methods of cable fault location.
8 M
3(b)
Explain routine and special test for transformer testing.
8 M
4(a)
Describe the faults in induction motors.
8 M
4(b)
Describe the testing of capacitor banks.
8 M
Solve any one question from Q.5(a,b) & Q.6(a,b)
5(a)
Compare overhead and underground distribution system with focus on volume of copper required for conductor.
6 M
5(b)
A single phase distributor AB of 500 mt long is fed from end A and is loaded as below:
i) 100 A at 0.7 power factor lagging 300 mt. from A.
ii) 200 A at 0.85 power factor lagging 500 mt. From a. The total resistance and reactance of the districutor is 0.25 Ω and 0.15Ω per km. Calculate the total voltage drop in the distributor. The load power factors are referred to the referred to the voltage at the far end.
i) 100 A at 0.7 power factor lagging 300 mt. from A.
ii) 200 A at 0.85 power factor lagging 500 mt. From a. The total resistance and reactance of the districutor is 0.25 Ω and 0.15Ω per km. Calculate the total voltage drop in the distributor. The load power factors are referred to the referred to the voltage at the far end.
10 M
6(a)
Describe the energy losses in feeders.
6 M
6(b)
Explain how kelvin's law is helpful in deciding the economic choice of conductor.
10 M
Solve any one question from Q.7(a,b) & Q.8(a,b)
7(a)
Describe the various arrangements of bus bar in substations.
10 M
7(b)
Explain the method of testing earth resistance.
8 M
8(a)
Explain the procedure of installaion of underground LT service line.
8 M
8(b)
Explain the estimation of LT underground cable line for a substation. Justify your answer by considering cable size, price, labour rates, rate escalation.
10 M
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