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Module 15. Gas turbine engine
Upon what quality or characteristic of a lubricating oil is its viscosity index based?
•  Its rate of flow through an orifice at a standard temperature.
•  Its rate of change in viscosity with temperature change.
•  Its resistance to flow at a standard temperature as compared to high grade paraffin base oil at the same temperature.

Diverdeep asking:
•  viscosity is defined as mm^2/s for a determined temperature.

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