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Which of the following motor can be referred as a universal motor?

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Which of the following motor can be referred as a universal motor?

(a) DC shunt motor

(b) DC compound motor

(c) Permanent magnet motor

(d) DC series motor

I had been asked this question by my school teacher while I was bunking the class.

My doubt stems from Dynamics of Motor-Load Combination topic in chapter Dynamics of Electrical Drives of Electric Drives

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Right option is (d) DC series motor

For explanation I would say: DC series motor can operate on DC and AC. It is a universal motor. Universal motors are those motors that can operate on both DC and AC. DC shunt motor can only operate on DC because of pulsating torque in AC.

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