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If the speed of rotation of a separately excited dc machine is halved and the filed strength is also reduced to half of the original. Then the emf induced in the armature _____________

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If the speed of rotation of a separately excited dc machine is halved and the filed strength is also reduced to half of the original. Then the emf induced in the armature _____________

(a) reduces to 1/4th of original

(b) reduces to half of original

(c) remains same

(d) doubles

The question was posed to me by my school principal while I was bunking the class.

This question is from EMF Generated in the Armature in section Electromechanical Energy Conversions of Electrical Machines

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The correct choice is (a) reduces to 1/4th of original

Explanation: Emf is proportional to speed of rotation and flux.

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