If the viscosity must not be _ to a liquid oil film between two moving liquid.Ĭlarification: The viscosity the most important and the only property of the lubricating oils to determine the thickness and velocity of the liquid. Generally, the viscosity is the only factor that decides the thickness of the oil or lubricating liquid.ħ. Addition of linear polymers to the increases the V.I and oils with V.I higher than _ are prepared.Ĭlarification: Addition of the linear polymers to the increases the V.I and oils V.I higher than 100 are prepared. For such oils the V.I will be zero and for the viscosity of the oils which changes slightly with the change in temperature will have V.I high.Ħ. The viscosity of the oil changes rapidly with the change in temperature has _Ĭlarification: The viscosity of some lubricating oils changes by the change in the temperature very rapidly. H=viscosity at 100F of pennsylvanian crude oil having V.I 100ĥ. V=viscosity at 100F of standard coast oil having V.I zero. Here, the U=viscosity at 100F oil under the test. Mathematically, viscosity index can be given by _Ĭlarification: The viscosity index can be given by *100. The viscosity index is found by comparing the viscosity of the oil under the temperature of 1000F with two standard oils.Ĥ. The rate of change of the viscosity with raise in temperature is measured by an arbitrary scale called as _Ĭlarification: The rate of the change of the viscosity with raise in temperature is measured by an arbitrary scale called as viscosity index. So, the viscosity of an oil must be moderate.ģ. In internal combustion engines and aeroplanes, the engine must start at low temperature and as well they must be operated at high temperatures. The viscosity of an oil decrease when temperature _Ĭlarification: The viscosity of an oil decreases with an increase of the temperature. The flow of one layer of the liquid is actually opposed by the other layer of the same liquid.Ģ. The viscosity is more for the fluids having more density. Viscosity means the flow of the liquid is resisted by _Ĭlarification: The viscosity of the liquid is defined as the resistance offered by the liquid for its own flow. Viscosity cannot be measured in case of solids.Applied Chemistry Multiple Choice Questions on “Viscosity and Viscosity Index – 1”.ġ. Viscosity concept is only applied to fluids i.e. The fluid that has high viscosity will flow slowly whereas the fluid having low viscosity will flow faster comparatively. We have to remember that the viscosity depends upon the flowing capability of a fluid. Honey, Glues, Peanut butter, Long hydrocarbon chain, Ketchup and many more. The unit of viscosity is \.Įxamples of substances that has high viscosity: In the case of organic liquids the one that has a longer carbon chain will have high viscosity. Viscosity of fluid can be measured by using an instrument which is called viscometer. Viscosity is nothing but it defines the thickness of any fluid or ability of a liquid to flow. Honey is the one which is thicker than water or you can say it cannot flow at a good rate as water does since it has extremely high viscosity. We can look at an example for better understanding, on comparing water and honey. Generally fluids that are highly viscous cannot flow with good rate as compared to water which is less viscous. We must have to remember that the viscosity is a property of fluid that defines the ability of any fluid on how it flows. Low viscosity means the fluids that are less viscous now you can easily identify the fluids with high viscosity. When we talk of water it can easily flow thus it is a good example of the fluid that has low viscosity. Hint: We can look for the fluids that are thick in nature usually have higher viscosity.
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