Penetration test determines the _____________ of the grease?
Correct answer: A. Stiffness
- A. Stiffness
- B. Lubricating properties (e.g. oilness)
- C. Service temperature
- D. Variation in viscosity with temperature
Explanation
The penetration test measures grease consistency, which is its resistance to deformation and is commonly described as stiffness or softness. It does not directly measure lubricating ability, service temperature, or viscosity-temperature variation.
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