Higher viscosity of lubricating oil usually signifies_______________________?
Correct answer: D. Higher flash point and fire point
- A. Lower Reid vapour pressure
- B. Higher acid number
- C. Lower flash point and fire point
- D. Higher flash point and fire point
Explanation
Higher viscosity generally indicates a heavier, less volatile lubricating oil, which requires more heating to produce ignitable vapour. Therefore, its flash point and fire point are usually higher.
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