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How many types of lubricants are there on the basis of the shear strength?

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How many types of lubricants are there on the basis of the shear strength?

(a) 5

(b) 3

(c) 4

(d) 2

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

My question is from Classification of Lubricants topic in portion Lubricants of Applied Chemistry

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The correct choice is (c) 4

The explanation is: There are four types of lubricants according to the classification on the basis of the shear strength. They are solid, liquid, semi-solid and gaseous lubricants. Shear strength is the strength against the structural failure of the component.

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