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Secondary Winding

A 400/100 V, ...

Question

A 400/100 V, 10 kVA, 2-winding transformer is to be employed as an auto transformer to supply a 400 V circuit from a 500 V source. The kVA rating of an auto transformer is_______kVA.
50

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Solution

The correct option is A 50

$I_{1} = \frac{10000}{100} = 100 A$

$(k V A)_{a u t o} = \frac{500 \times 100}{1000} = 50 k V A$

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