Question

Which of the following are the properties of lubricants?

(a) viscosity

(b) flash point

(c) fire point

(d) all of the mentioned

I had been asked this question in semester exam.

The query is from Properties of Lubrication in section Engine Friction and Lubrication of IC Engine

Answer 1

The correct answer is:

(d) all of the mentioned

All of the listed options—viscosity, flash point, and fire point—are important properties of lubricants. They play key roles in determining the lubricant's ability to perform effectively under various engine operating conditions:

• Viscosity: Determines the oil's resistance to flow and its ability to form a lubricating film.
• Flash point: The temperature at which the oil produces enough vapors to ignite momentarily.
• Fire point: The lowest temperature at which the oil burns continuously when exposed to a flame.