A single phase 2 KVA, 100/200 V transformer is reconnected as an auto transformer such that its KVA rating is maximum. The new rating in KVA is
- A. 2 KVA
- B. 3 KVA
- C. 4 KVA
- D. 6 KVA
Answer: D. 6 KVA
Explanation: Rated current of 200 V winding = 2000/200 = 10 A. In autotransformer configuration stepping up to 300 V, output capacity = 300 V × (10 + 10 A) = 6 kVA.