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No load rotational losses in electrical machine consists of _____________

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No load rotational losses in electrical machine consists of _____________

(a) Friction and windage losses

(b) Stator core, friction and windage losses

(c) Rotor core, friction and windage losses

(d) No load core, friction and windage losses

The question was posed to me in final exam.

Question is from Losses and Efficiency in division Rating and Loss Dissipation of Electrical Machines

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Right answer is (d) No load core, friction and windage losses

To explain: The sum of friction and windage loss under no load is called no load rotational losses.

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