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Variable losses are proportional to ________

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Variable losses are proportional to ________

(a) Armature current

(b) Square of armature current

(c) Inverse of armature current

(d) Inverse of square of armature current

This question was posed to me during an internship interview.

The origin of the question is Efficiency of DC Machine- 2 topic in section Efficiency and Testing of DC Machines

1 Answer

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Best answer
Right choice is (b) Square of armature current

The explanation: Variable losses include losses in armature resistance and losses in series resistance, which are directly proportional to the square of armature current. It also includes stray load loss (iron plus copper) which is proportional to square of armature current.

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