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Which test is used to measure the resistance to flow of the lubricating oil?

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Which test is used to measure the resistance to flow of the lubricating oil?

(a) Pour point test

(b) Gravity test

(c) Colour test

(d) Velocity test

This question was addressed to me during an online exam.

I'd like to ask this question from Lubrication System topic in portion Lubrication System and Tractor’s Classification of Farm Machinery

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Best answer
Correct choice is (d) Velocity test

Best explanation: The viscosity of a fluid is the measure of its resistance to flow. The oil should be viscous enough to maintain a fluid film between the bearing surfaces. In order to measure viscosity of lubricating oil, an instrument called Saybolt viscosimeter is used.

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