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A high viscosity index indicates relatively ____________ changes in viscosity of the oil with the temperature.

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A high viscosity index indicates relatively ____________ changes in viscosity of the oil with the temperature.

(a) larger

(b) smaller

(c) constant

(d) none of the mentioned

The question was posed to me in quiz.

Enquiry is from Properties of Lubrication topic in portion Engine Friction and Lubrication of IC Engine

1 Answer

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by (65.4k points)

The correct answer is:

(b) smaller

A high viscosity index indicates relatively smaller changes in the viscosity of the oil with temperature. Oils with a high viscosity index maintain more consistent viscosity across a wide range of temperatures, providing better lubrication performance in varying engine conditions.

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