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Which motor has almost replaced DC shunt motor from its applications?

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Which motor has almost replaced DC shunt motor from its applications?

(a) Wound-rotor induction motor

(b) Differential compound motor

(c) Air motor

(d) Squirrel caged induction motor

I have been asked this question by my college professor while I was bunking the class.

My question is based upon Applications of DC Machines topic in division DC Machines of DC Machines

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Correct option is (d) Squirrel caged induction motor

The best explanation: Owing to the relative simplicity, cheapness and ruggedness of the squirrel cage induction motor, the shunt motor is less preferred for constant-speed drives except at low speeds. At high or medium speed applications we use induction motor, mostly squirrel caged.

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