I am confused with the above problem. If I connect all 3 windings additively, I will get 3V1/3V2. But, I don't think there will be any change in kVA rating. It should still remain Q. The answer given in my workbook is option A. Please help me with this problem.
EDIT: It is not a homework problem. I am preparing for an exam called GATE(Graduate Aptitude Test in Engg). It is a previously asked problem in the exam.
Answer
After trying for sometime, I have figured out that the only way it makes sense is when I consider the ratings are each winding and not for the 3 phase transformer.
Each winding is rated Q kVA and V1/V2
Now when you connect three windings additively, you get a single phase transformer with rating 3V1/3V2 and 3Q kVA
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