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How many principle types of lubricants are available in the PMDC motor?

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in Design of Electrical Machines by (687k points)
How many principle types of lubricants are available in the PMDC motor?

(a) 2

(b) 3

(c) 5

(d) 7

This question was posed to me during an online interview.

Enquiry is from Design Steps and Considerations in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Right answer is (b) 3

The best I can explain: There are 3 principle types of lubricants in use. They are oil, dry film lubricants and grease.

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