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The armature in DC machines is always placed on rotor because _______

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The armature in DC machines is always placed on rotor because _______

(a) Otherwise commutation will not be possible

(b) Otherwise there will not be any induced emf

(c) Otherwise current will not flow

(d) Can be placed anywhere

This question was posed to me during an online interview.

This intriguing question originated from Brushes and Commutator Assembly in portion DC Machines of DC Machines

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The correct answer is (a) Otherwise commutation will not be possible

Explanation: A DC machine is a heteropolar structure with stationary poles and the rotating armature. The armature winding of a DC machine is placed on the rotor to improve commutation i.e. to convert the alternating voltage produced in the winding into direct voltage at the brushes.

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