Viscosity index of a lubricating oil_________________?
Correct answer: B. Is the measure of variation of viscosity with temperature
- A. Is the measure of its flash point
- B. Is the measure of variation of viscosity with temperature
- C. Should be low
- D. None of these
Explanation
Viscosity index expresses how strongly an oil’s viscosity changes with temperature. A high index is desirable because the viscosity remains more stable, whereas flash point is a separate safety property.
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