Higher viscosity index of a lubricating oil denotes_______________?
Correct answer: A. Less changes in fluidity of oil with temperature
- A. Less changes in fluidity of oil with temperature
- B. Substantially high change in fluidity of oil with temperature
- C. Its unsuitability under varying temperature conditions
- D. None of these
Explanation
A high viscosity index means the oil's viscosity changes relatively little as temperature changes. Such oils retain more consistent flow properties over a wide operating-temperature range.
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