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A power transmission line feeds input power at 2300 v to a step down transformer with primary windings having 4000 turns the output power is delivered at 230 v by the transformer if the current in the primary of transformer is 5A and its efficiency is 90% the output current would be

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35 A

50 A

40 A

45 A

answer is A.

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Detailed Solution

Efficiency $n = \frac{V_{s} I_{s}}{V_{i n} I_{i n}}$

$\frac{90}{100} = \frac{230 \times I_{s}}{2300 \times 5} I_{s} = 45 A$

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