Book 2: 6-30 - "Lubrication" Flashcards
If oil has a high viscosity index (VI), this indicates that its viscosity:
Select one:
A. Changes little with pressure change
B. Changes greatly with temperature change
C. Does not changes with temperature change
D. Changes greatly with pressure change
E. Changes little with temperature change
E. Changes little with temperature change
Lubricants are frequently used to provide sealing between:
Select one:
A. Screws and cylinder walls
B. Lobes and cylinder walls
C. Stationary and moving blades
D. Impellers and casing walls
E. Piston and cylinder walls
E. Piston and cylinder walls
Materials that are used as solid lubricants include all of the following except:
Select one:
A. Soapstone
B. Petroleum oil
C. Graphite
D. Molybdenum disulphide
E. Mica
B. Petroleum oil
The pour point of oil is the _____ at which the oil will flow.
Select one:
A. Highest temperature
B. Lowest pressure
C. Lowest viscosity
D. Lowest temperature
E. Highest pressure
D. Lowest temperature
One of the general classes of lubricants is the:
Select one:
A. Oil
B. Liquid
C. Semi-liquid
D. Gas
E. Grease
B. Liquid
In cases where surfaces come together with some impact, as with _____, the lubricant serves to absorb shock.
Select one:
A. Pump impellers
B. Pump pistons
C. Gas turbine blades
D. Pump lobes
E. Gear teeth intermeshing
E. Gear teeth intermeshing
The fire point of oil is the temperature at which enough vapour is given off to:
Select one:
A. Burst into flames
B. Ignite
C. Burn continuously
D. Give off smoke
E. Ignite momentarily
C. Burn continuously
The neutralization number indicates the _____ of oil.
Select one:
A. Acidity
B. Volatility
C. Alkalinity
D. Neutralization
E. Carbonization
A. Acidity
Frequently, it is possible to improve the desirable characteristics of lubricating oil by the use of all of the following additives except:
Select one:
A. Anti-oxidants
B. Emulsion breakers
C. Viscosity index (VI) improvers
D. Detergent-dispersants
E. Antifoam additives
B. Emulsion breakers
Synthetic Oils include:
Select one:
A. Petroleum oil
B. Castor oil
C. Polyglycols and silicones
D. Lard
E. Whale oil
C. Polyglycols and silicones
As well as separating the bearing surfaces, the lubricant forms a film on the surfaces, thus protecting them from:
Select one:
A. Pressure
B. Air
C. Moisture
D. Corrosion
E. Temperature
D. Corrosion
Often chemical compounds (additives) are added to the lubricant to prevent the formation of _____ due to oxidation of the oil.
Select one:
A. Mercaptans
B. Acids
C. Hydrocarbons
D. Alkalines
E. Alkaloids
B. Acids
Mineral oils are produced from _____ and are the most commonly used class
Select one:
A. Castor oil
B. Animal origin
C. Crude petroleum
D. Vegetable origin
E. Lard
C. Crude petroleum
The flash point of oil is the temperature at which the oil gives off sufficient vapour to _____ when mixed with air and exposed to a source of ignition.
Select one:
A. Give off smoke
B. Burn continuously
C. Burst into flames
D. Ignite momentarily
E. Ignite
D. Ignite momentarily
A common arrangement for temperature control is to _____ the lubricant to the bearing where it picks up heat.
Select one:
A. Use higher viscosity
B. Air cool
C. Circulate generous quantities of
D. Water cool
E. Circulate minimal quantities of
C. Circulate generous quantities of