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All others are advantages of DC motor over AC motor except _______________

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All others are advantages of DC motor over AC motor except _______________

(a) Low cost

(b) Wide speed range

(c) Stability

(d) High starting torque

This question was addressed to me in my homework.

This key question is from DC Motor Basics -2 topic in chapter DC Motors of DC Machines

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Right answer is (a) Low cost

To explain I would say: Dc machine is very useful over AC when operation is concerned but its superior speed control system itself requires 2 more machines. DC machine requires high maintenance due to commutator and brushes so it is an expensive machine.

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