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Inspite of heavy initial investments, dc motors are used due to _____________

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Inspite of heavy initial investments, dc motors are used due to _____________

(a) flexibility and ease of control

(b) lower losses

(c) improved power factor of the system

(d) all of the mentioned

This question was posed to me in an interview for job.

This interesting question is from DC Machine Applications in section DC Machines of Electrical Machines

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Correct choice is (a) flexibility and ease of control

Easy explanation: The control of dc machines is very much simplified when compared to other machines. So this makes it very useful when compared.

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