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A transformer's rating can be increased by fitting fans because

  • A.the fans reduce the flux required in the core
  • B.the fans lower the resistance of the windings
  • C.forced air removes more heat from the radiators
  • D.the fans reduce the losses in the windings

Answer: C

The losses are unchanged, but a lower thermal resistance to ambient means the same temperature rise accommodates a larger loss and therefore a larger load. That is what the ONAN and ONAF ratings on a nameplate describe.

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