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The induced emf in the armature of a 4-pole dc machine is ________

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The induced emf in the armature of a 4-pole dc machine is ________

(a) directly proportional to speed and field strength applied to it

(b) directly proportional to speed

(c) directly proportional to field strength applied to it

(d) inversely proportional to speed and inversely proportional to field strength applied to it

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

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

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Right option is (a) directly proportional to speed and field strength applied to it

The explanation is: Emf is proportional to speed of rotation and flux.

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