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Transformers - Technical MCQs

Q1:

If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is

A 100 W

B 50 W

C 75 W

D 200 W

ANS:A - 100 W

As written in the question that this is an Ideal Transformer.

The ideal transformer is the one whose efficiency is 100% so output power will be same.

i.e., Efficiency = P2/P1 so if PI is 100W then after 100% efficiency the output power will also be 100W.

So Efficiency = p2/p1 x 100 = 100/100 x 100 = 1 x 100 = 100%.