Unit 1 Lubrication and Bearings Flashcards
The point at which oil will give off enough vapour to ignite and burn continuously is known as the \_\_\_\_\_ point. Select one: a. Flash b. Ignition c. Fire d. Vaporization
c. Fire
When grease is used in an antifriction bearing after cleaning, the bearing housing should not be filled \_\_\_\_\_ full. Select one: a. more than 1/3 b. more than 1/2 c. more than 3/4 d. less than completely
a. more than 1/3
The characteristics of a grease are determined by: Select one: a. Its thickening agent or “soap” b. Its consistency c. The type of oil used in the grease d. Its protective coating
a. Its thickening agent or “soap”
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. Have low carbon residue
Applying installation forces through the balls of a bearing can cause: Select one: a. Bearing misalignment b. too large an air gap c. Cracking or breaking of the balls d. Brinelling
d. Brinelling
A common cause of antifriction bearing failure is: Select one: a. High RPM service b. Extreme cold temperature cracking c. Drive motor overload d. Shaft misalignment
d. Shaft misalignment
The majority of lubricants are: Select one: a. Animal fats b. Synthetic oils c. Mineral oils d. Greases
c. Mineral oils
The lubricant for an anti-friction bearing:
Select one:
a. Will separate the moving parts completely
b. Must be cooled
c. Could be a semi-solid lubricant
d. Should have a high viscosity
c. Could be a semi-solid lubricant
Grease:
Select one:
a. Is a semi-liquid
b. Is an excellent high-speed, low load lubricant
c. Attracts dirt and water to bearings, leading to premature failure
d. Can be used under conditions where oil may leak away and leave the bearing dry
d. Can be used under conditions where oil may leak away and leave the bearing dry
Using pressurized air to blow out a cleaned bearing:
Select one:
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”
With antifriction bearings using grease, the bearings:
Select one:
a. Must be cleaned twice as often as oil-lubricated bearings
b. can be cleaned by adding solvent to the grease cartridge
c. Are cleaned less often than oil-lubricated bearings
d. Never require cleaning
c. Are cleaned less often than oil-lubricated bearings
All semi-solid lubricants: Select one: a. Have a low viscosity b. Are capable of sealing out dirt and water from bearings c. Contain graphite d. Resist moisture
b. Are capable of sealing out dirt and water from bearings
The groove that is cut in the top half in the lining of a shell bearing should not extend closer to the ends than: Select one: a. 3 mm b. 10 mm c. 1.25 cm d. 1.7 cm
c. 1.25 cm
A thrust bearing which does not utilize the oil wedge principle of lubrication is the: Select one: a. Michell type b. Collar type c. Radial type d. Kingsbury type
b. Collar type
Which of the following has the greatest effect on the viscosity of lubrication oil? Select one: a. Pressure b. Load c. Temperature d. Speed
c. Temperature
The cheapest and most commonly used grease is: Select one: a. Potassium base b. Chlorine base c. Lime base d. Sulphate base
c. Lime base
The ability of an oil to lift and support heavy loads depends upon: Select one: a. kinetic energy b. Hydraulic pressure c. acceleration d. Pour point
b. Hydraulic pressure
When inspecting a dismantled bearing, the first indication of a failing bearing is: Select one: a. Cracked balls b. Roughness c. Discoloration d. Rusting or corrosion e. Tapered rollers
b. Roughness
The proper way to store a bearing after cleaning is to dip it in \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ and wrap it in grease-proof paper. Select one: a. a desiccant such as rice b. Wax c. Solvent d. A rust preventative
d. A rust preventative
If an oil must flow at a very low temperature, it must have the following additive: Select one: a. Viscosity index improver b. Pour point depressant c. Dispersant d. Floc point improver
b. Pour point depressant
An anti-friction bearing: Select one: 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
When replacing or removing an anti-friction ball bearing, the applied force should:
Select one:
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
The resistance of a liquid to internal deformation or shear is known as: Select one: a. Pour point b. Viscosity index c. Flash point d. Viscosity
d. Viscosity
The property of oil that indicates its ability to support a load is: Select one: a. Viscosity b. Viscosity index c. Pour point d. Floc point
a. Viscosity