VA rating of the autotransformer

Q.  For a two winding transformer if VA rating is given by (VA)tw and K is the transformation ratio of an autotransformer then the VA rating of the autotransformer is given by
- Published on 30 Oct 15

a. (K/(K-1)) * (VA)tw
b. (K/(1-K)) * (VA)tw
c. ((1-K)/K) * (VA)tw
d. ((K-1)/K) * (VA)tw

ANSWER: (K/(K-1)) * (VA)tw

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