Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
Correct answer: D. Its secondary current is 20 A
- A. Its secondary current is 5 A
- B. Its secondary voltage is 400 V
- C. Its rating is 2 kVA
- D. Its secondary current is 20 A
- E. It is a step-up transformer
Explanation
For an ideal transformer, V₂/V₁ = N₂/N₁ = 2, so V₂ = 400 V, while current changes inversely to 5 A. Its input and output rating are 200 × 10 = 400 × 5 = 2 kVA, making it a step-up transformer; therefore 20 A is the incorrect statement.
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