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The condition for maximum efficiency for a DC generator is __________

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The condition for maximum efficiency for a DC generator is __________

(a) Eddy current losses = stray losses

(b) Hysteresis losses = eddy current losses

(c) Copper losses = 0

(d) Variable losses = constant losses

The question was posed to me in homework.

My question comes from Efficiency of DC Machine- 2 topic in section Efficiency and Testing of DC Machines

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The correct choice is (d) Variable losses = constant losses

The explanation is: All losses in a given DC machine can be categorized into variable losses and constant losses. Variable losses are proportional to the square of armature current while constant losses are almost constant for a given DC machine throughout its application.

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