Question

At the lowest temperature there should separation of solids, and at the highest temperature it should not vapourise beyond a certain limit.

(a) True

(b) False

I had been asked this question in an online interview.

This interesting question is from Properties of Lubrication topic in division Engine Friction and Lubrication of IC Engine

Answer 1

The correct answer is:

(a) True

At the lowest temperature, the oil should not have solids separating out, as this could hinder its ability to lubricate effectively. At the highest temperature, the oil should not vaporize beyond a certain limit, as excessive vaporization could lead to insufficient lubrication and potential engine damage. This balance ensures that the oil maintains its lubricating properties across a wide range of operating conditions.