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In dc machine iron losses cause ____________

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In dc machine iron losses cause ____________

(a) heating in core

(b) loss in efficiency

(c) rise in temperature of ventilating air

(d) all of the mentioned

The question was posed to me during an online exam.

My question is from Cooling (Loss Dissipation) in chapter Rating and Loss Dissipation of Electrical Machines

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The correct option is (a) heating in core

Easiest explanation: The iron losses cause heating of the core which causes reduction inefficiency and cooling air gets heated up.

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