Discussion
Match the property with what it governs.
1. Viscosity index 2. Pour point 3. Flash point
P. Safety at the working temperature Q. Change of viscosity with temperature R. Ability to be pumped when cold
Answer: B
Correct answer: 1-Q, 2-R, 3-P
Three properties governing three quite different things. The viscosity index describes how much the viscosity changes with temperature. The pour point is the lowest temperature at which the oil will still flow, and so governs whether it can be pumped on a cold start. And the flash point is a safety limit, setting the temperature above which the oil must not be run.
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