ISRO Scientist or Engineer Electrical 2015

Instructions

For the following questions answer them individually

Question 71

String efficiency of 100% meansin string insulators

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Question 72

To limit current chopping in Vacuum Circuit Breakers (VCB), the contact material used has

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Question 73

In a three phase four wire unbalanced system, the current in the neutral wire is 18 A. The magnitude of zero sequence current is

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Question 74

The positive $$(Z_1)$$, negative $$(Z_2)$$ and zero $$(Z_0)$$ sequence impedances of a solidly grounded system under steady state condition always follow the relation

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Question 75

Eddy currentloss in core of a transformer is

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Question 76

The square root of $$64 \angle 36^\circ$$

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Question 77

Match the correct pairs :

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Question 78

What is Laplace Transform of $$(\sin h(at))$$?

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Question 79

If a phasor is multiplied by j then

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Question 80

If two complex numbersare equal

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