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What is the supply given to the tractive electromagnets?

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What is the supply given to the tractive electromagnets?

(a) only dc supply

(b) only ac supply

(c) ac and dc supply

(d) ac or dc supply

I have been asked this question in an online interview.

This intriguing question comes from Types of Electromagnets in section Design of Electromagnets of Design of Electrical Machines

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The correct option is (d) ac or dc supply

Easy explanation: The other name for the tractive electromagnet is solenoids. The tractive electromagnets are operated either from ac or dc supply.

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