If an oil's viscosity changes a lot with little temperature change then it will have?
Select one:
a. low viscosity index
b. high pour point
c. high
... [Show More] carbon residue
d. high viscosity index - ✔✔ a
Besides physically removing heat from a component, how does oil reduce the heat in a bearing?:
Select one:
a. it reduces the specific heat of the air in the bearing housing
b. it reduces wear
c. it increases the heat transfer
d. it reduces friction - ✔✔ d
Of the following, which is NOT a function of the oil in a steam turbine oil system?
Select one:
a. governor control system fluid
b. heat removal
c. pour point suppression
d. friction reduction - ✔✔ c
The intermeshing of gear teeth is a place where
Select one:
a. temperature control is very important
b. friction reduction is very important
c. sealing is very important
d. shock absorption is very important - ✔✔ d
If a lubricant oil has a high viscosity index number, this means it will:
Select one:
a. change a great deal with temperature change
b. not change at all with temperature increase
c. vaporize with temperature increase
d. change little with temperature change - ✔✔ d
If a piece of machinery were particularity difficult to reach and service, what type of lubricant would be useful?:
Select one:
a. an oil
b. a grease
c. a solid lubricant
d. a grease stick - ✔✔ c
What type of oil do open gears require?:
Select one:
a. high viscosity oil
b. semi-solid oil
c. oil with a low pour point
d. low viscosity oil - ✔✔ a
The separation of two surfaces, which is brought about by an interposing liquid, is called
Select one:
a. lubrication
b. viscosity index
c. floc point
d. oil flooding - ✔✔ a
Which class of liquid lubricant is not often used on its own?:
Select one:
a. mineral oils
b. synthetic oils
c. fixed oils
d. mixed base oils - ✔✔ c
Fixed oils are also known as:
Select one:
a. synthetic oils
b. fatty oils
c. mineral oils
d. rock oils - ✔✔ b
The type of grease used for heavily loaded machinery operating at slow speeds is:
Select one:
a. sodium base grease
b. specialty grease
c. mixed base grease
d. calcium base grease - ✔✔ b
Air compressor oil should:
Select one:
a. have a very low viscosity
b. have low carbon residue
c. have a low flash point
d. not contain anti-oxidants - ✔✔ b
An oil with a low viscosity index:
Select one:
a. is a very thin oil, which does not change viscosity with temperature change
b. is a very thick oil, which does not change viscosity with temperature change
c. goes through a large change in viscosity when subject to temperature change.
d. goes through a small change in viscosity when subject to temperature change. - ✔✔ c
The most common and cheapest greases are not suitable for:
Select one:
a. temperatures above 70°C
b. sealing dirt from bearings
c. applications where they must stay in place
d. applications where the components are infrequently lubricated - ✔✔ a
At elevated temperatures oil can evaporate, which causes it to: Select one:
a. separate
b. thicken
c. burn
d. corrode - ✔✔ b [Show Less]