9. High VI fluid exhibits a) a small change in fluid viscosity as the b) a high
ID: 2074365 • Letter: 9
Question
9. High VI fluid exhibits a) a small change in fluid viscosity as the b) a high change in fluid viscosity as the c) no change with the fluid viscosity as the d) an exponential change in fluid viscosity as the temperature changes. temperature changes temperature changes. temperature changes. 10. In general, as the temperature increases, a) the viscosity of liquids will decrease. b) the viscosity of gases will decrease. c) the viscosity of liquids will increase. d) the viscosity of gases will increase. e) Choices (a) & (d) Choices (b) & (c).Explanation / Answer
9) High VI uid exhibits: a) a small change in uid viscosity as the temperature changes.
10) as the temperature increases,c) Choices (a) & (d) (i.e. viscocity of liquids will decrease and viscosity of gasses will increase)
EXPLANATION
9) VI - viscosity Index is an arbitrary measure of how the viscosity of a fluid changes with temperature or a measure of resistance of change in viscosity to temperature.
Hence higher the VI value lesser will be the change in viscosity with increase in temperature
10) The viscosity of the gas increases as temperature Increases proportional to the square root of temperature as gas thicken when there is no change in volume with increase in temperature.
The viscosity of the liquid decreases as temperature Increases proportional to the square root of temperature as the vanderwalls forces decreases with increase in temperature.Therby reducing the resistance to flow of molecules
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