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The reduction in friction is only when _________ of the oil film is __________ than that of the metal.

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The reduction in friction is only when _________ of the oil film is __________ than that of the metal.

(a) shear strength, more

(b) shear strain, less

(c) shear strain, more

(d) shear strength, less

I have been asked this question in an internship interview.

Question is taken from Selection of Lubricants topic in division Lubricants of Applied Chemistry

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Right option is (d) shear strength, less

To explain: The friction in friction is only when shear strength of the oil film must be less than the metal. This will reduce the electricity consumption.

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