Non loading heat run test on transformers is performed by means of -
- A. SC test.
- B. OC test.
- C. Half time on SC and half time on OC.
- D. Sumpner's test.
Answer: D. Sumpner's test.
Explanation: Sumpner's (back-to-back) test loads both transformers thermally with only the losses drawn from the supply (heat run test).