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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 torqueThis 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

Answer»

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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