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Powder of a solid lubricant delivered to the __________

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Powder of a solid lubricant delivered to the __________

(a) rubbing area

(b) composite material

(c) film

(d) surface

This question was addressed to me in an online quiz.

This intriguing question originated from Classification of Lubricants topic in chapter Lubricants of Applied Chemistry

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Best answer
Right option is (a) rubbing area

The explanation is: The powder of the solid lubricant is delivered to the rubbing area that means dry lubrication and it has good adhesiveness. Composite coating consists of the particles of a solid lubricant and dispersed throughout matrix.

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