SSC JE Electrical Engineering 3rd March 2017 Shift-1

Instructions

For the following questions answer them individually

Question 71

The short-circuit characteristic of an alternator is ________.

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Question 72

The ratio of armature leakage reactance to synchronous reactance of a large size modern alternator is about ________.

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Question 73

High speed alternators usually have ________.

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Question 74

Compared to the secondary of a loaded step-up transformer, the primary has ________.

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Question 75

Under operating conditions the secondary of a current transformer is always short circuited because ________.

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Question 76

During short-circuit test, the iron loss of a transformer is negligible because ________.

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Question 77

When a 400-Hz transformer is operated at 50 Hz, its kVA rating is ________.

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Question 78

The ordinary efficiency of a given transformer is maximum when ________.

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Question 79

While conducting short-circuit test on a transformer the following side is short-circuited ________.

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Question 80

In transmission lines the cross-arms are made of ________.

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