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Question

A step down transformer having efficiency of 75 supplies 3 ampere current at 120 volt. Calculate the current in its primary coil, if it is operated at 440 volt.

A
2
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B
1
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C
3
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D
4
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Solution

The correct option is B 1
We know efficiency η=PoutPin
η=.75
Pout=I0V0
=3×120=360 W
Pin=PoutηIsVs=PoutηIs=3600.75×440=1.09A

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