Module - Lubrication - Part B Flashcards
Proper level of lubricant in a rolling element bearing is
a) halfway up the second from bottom rolling element.
b) halfway up the top rolling element.
c) halfway up the lowest rolling element.
d) halfway up the complete bearing (to the centreline of the shaft).
c) halfway up the lowest rolling element.
Movement of oil in a wick feed oiler is by
a) pump.
b) centrifugal force.
c) gravity.
d) capillary action.
d) capillary action.
A measure of grease stiffness is referred to as
a) cone test.
b) drop point.
c) consistency .
d) viscosity.
c) consistency
Thickeners for greases can be made from compounds that are classified chemically as
a) emulsifiers.
b) squeegees.
c) soaps.
d) solid solubles.
c) soaps.
The system which offers advantages where there are a large number of lubrication points is the
a) drop feed lubricator system.
b) wick feed lubricator system.
c) ladder lubricator system.
d) centralized lubrication system.
d) centralized lubrication system.
What is the formula for Surface Speed?
(RPM x π x Dia) / 12 = Feet per minute
Why is it important not to allow the oil level in an oil bath lubrication system to go above the centreline of the lowest rolling element?
To avoid churning, which would produce extra heat.
What are two disadvantages of a bottle lubricator?
- Oil is not recirculated, but wasted.
2. It is restricted to uses where surface speeds are low.
Should a constant level lubricator be mounted on the left or the right side of the housing if the rotation is clockwise?
Left side.
What are two important functions of a sight glass on a lubrication system?
To monitor the oil level and the condition of the oil.
Is it best to take an oil sample immediately after a machine has been running at its normal operating temperature or after it has cooled down?
Immediately after running, to establish a wear rate for the machine.
What is a grease?
Grease is a liquid lubricant mixed with a thickener.
How does a grease thickener work?
The thickener acts like a sponge to hold the lubricant and also controls the flow of the grease to the area to be lubricated.
What is drop point referring to in a grease?
This is the lowest temperature at which the lubricant will begin to drip from a grease.
What is one of the oldest grease thickeners used?
Soap