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Excessive friction takes place, when the viscosity is ________

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Excessive friction takes place, when the viscosity is ________

(a) Too high

(b) Too low

(c) Moderate

(d) Zero

I have been asked this question during a job interview.

My doubt stems from Viscosity and Viscosity Index topic in division Lubricants of Applied Chemistry

1 Answer

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The correct option is (a) Too high

For explanation I would say: The excessive friction takes place when the viscosity of the lubricating oil is too high. As the viscosity is too high then the layers of the sliding liquids will be moving fast and overlap on one another and causes the excess friction.

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