B-01: Lubrication And Bearings Flashcards
(20 cards)
When inspecting a dismantled bearing, the first indication of a failing bearing is:
A. Cracked balls
B. Roughness
C. Discolouration
D. Rusting or corrosion
E. Tapered rollers
B. Roughness
Which of the following has the greatest effect on the viscosity of lubrication oil?
A. Pressure
B. Load
C. Temperature
D. Speed
C. Temperature
What is done to prevent foreign matter (dust, grit, water) from entering the bearing house and prevent the lubricant from leaving the housing?
A. two circular metal rings, known as races, are installed
B. Seals are installed on the shaft
C. A separator is used
D. Grease is used instead of lubrication oil
B. Seals are installed on the shaft
A large journal bearing which is running hotter than normal can be cooled by:
A. Direct application of cool water
B. Loosening the bearing caps
C. Decreasing the viscosity of the oil by cooling it
D. Pumping additional grease into it
B. Loosening the bearing caps
A form of lubrication that requires continual motion of a shaft or surface is:
A. Boundary lubrication
B. Continuous lubrication
C. Forced lubrication
D. Fluid film lubrication
D. Fluid film lubrication
The instrument that measures the viscosity of an oil at a certain temperature as it flows through a small diameter tube, is called:
A. An orifice plate
B. A saybolt viscometer
C. An oil meter
D. A vena contracta
B. A saybolt viscometer
Fluid film lubrication:
A. Eliminates all bearing friction
B. Is different from flood lubrication
C. Supports heavy loads
D. Prevents wear during start-up
C. Supports heavy loads
Using pressurized air to blow out a cleaned bearing:
A. Should only be done in well-ventilated areas
B. Must be done only while the bearing is hot
C. Will cause the bearing to become “pitted”
D. Should be done at an angle so the bearing can spin
C. Will cause the bearing to become “pitted”
The ability of an oil to lift and support heavy loads depends upon:
A. Kinetic energy
B. Hydraulic pressure
C. Acceleration
D. Pour Point
B. Hydraulic pressure
An anti-friction bearing:
A. Is constructed with white metal alloy
B. Wears to a smooth, low-friction surface
C. Has rolling friction
D. Is a sleeve bearing
C. Has rolling friction
Air compressor oil should:
A. Have a very low viscosity
B. Have a low carbon residue
C. Have a low flash point
D. Not contain anti-oxidants
B. Have low carbon residue
If an oil must flow at a very low temperature, it must have the following additive:
A. Viscosity index improver
B. Pour point depressant
C. Dispersant
D. Floc point improver
B. Pour point depressant
When replacing or removing an anti-friction ball bearing, the applied force should:
A. Not be transmitted through the bearing balls
B. Always be against the inner race
C. Always be against the outer race
D. Be made only after heating the bearing
A. Not be transmitted through the bearing balls
A material that is commonly used as a solid lubricant is:
A. Tallow
B. Lime
C. Molybdenum disulfide
D. Sodium carbonate
C. Molybdenum disulfide
The _____ number of oil indicates the acidity of oil.
A. Acidity
B. Alkalinity
C. Neutralization
D. Viscosity index
C. Neutralization
Which of the following is NOT one of the three general classes of lubricants?
A. Synthetic oil
B. Semi-solids
C. Solids
D. Liquids
A. Synthetic oils
The point at which oil will give off enough vapour to ignite and burn continuously is known as the _____ point.
A. Flash
B. Ignition
C. Fire
D. Vaporization
C. Fire
The characteristics of a grease are determined by:
A. It’s thickening agent or “soap”
B. It’s consistency
C. The type of oil used in the freeze
D. It’s protective coating
A. It’s thickening agent or “soap”
The groove that is cut in the top half in the lining of a shell bearing should not extend closer to the ends than:
A. 3mm
B. 10mm
C. 1.25 cm
D. 1.7 cm
C. 1.25 cm
If ambient air temperatures are very low, the preferred lubricant is a:
A. Solid
B. Semi-solid
C. Fixed oil
D. Liquid
A. Solid
