The forced oil and air circulation method is usual one for transformers of capacities____________?
Correct answer: D. 30 MVA upwards
- A. upto 5 MVA
- B. upto 10 MVA
- C. upto 20 MVA
- D. 30 MVA upwards
Explanation
Forced oil and air circulation is used when natural cooling is insufficient for very large transformers, typically those rated 30 MVA and above. Smaller transformers generally use natural oil and air circulation or simpler assisted cooling.
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