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Which of the following is not a solid lubricant?

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in Construction & Building Materials by (190k points)
Which of the following is not a solid lubricant?

(a) Graphite

(b) Mica

(c) Grease

(d) Soapstone

I have been asked this question in an interview.

I want to ask this question from Miscellaneous Materials in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

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The correct answer is (c) Grease

The best I can explain: With the use of lubricants, easy motion of the moving parts of a machine is facilitated. There are two types of lubricants – solid lubricants and liquid lubricants. Graphite, mica and soapstone are examples of solid lubricants while grease is a liquid lubricant.

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