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Which of the following DC motor has the poorest speed control?

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Which of the following DC motor has the poorest speed control?

(a) Differentially compounded motor

(b) Cumulatively compounded motor

(c) Shunt motor

(d) Series motor

This question was posed to me in examination.

I want to ask this question from Speed Control Using Field Control of Series Motor topic in division DC Motors of DC Machines

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The correct answer is (d) Series motor

For explanation: DC series motor at no load condition gives infinite speed ideally. Practically it will damage all the armature circuit. Thus, as the load is reduced speed of the motor will go on increasing rapidly. So, speed control is very poor in series motor.

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