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The overall efficiency of a transformer ...

The overall efficiency of a transformer is `90%`.The transformer is rated for an output of `9000` watt.The primary voltage is `1000` volt.The ratio of turns in the primary to the secondary coil is `5:1`.The iron losses at full load are `700` watt.The primary coil has a resistance of `1 ohm`.
In the above, the copper loss in the secondary coil is

A

`100` watt

B

`700` watt

C

`200` watt

D

`1000` watt

Text Solution

Verified by Experts

The correct Answer is:
C
Cu losses in secondary coil `=(1000-700)-100`
`=200` watt.
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