Lube ops
Lubrication Components
Viscosity
Lubricants
A little bit of everything
100
What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?
The oil pressure will be lower than normal.
100
An oil separator is generally associated with which of the following?
Engine-driven vacuum pump.
100
Upon what quality or characteristic of a lubricating oil is its viscosity index based?
Its rate of change in viscosity with temperature change.
100
What has the greatest effect on the viscosity of lubricating oil?
Temperature
100
In a reciprocating engine oil system, the temperature bulb senses oil temperature
at a point after the oil has passed through the oil cooler.
200
Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of ___________ water at a specific _______________
distilled, temperature
200
What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?
The return oil will be pumped overboard.
200
Resistance to flow
Viscosity of a liquid
200
What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?
Chemical stability.
200
Oil tank fillers on reciprocating engines are marked with the word and IAW with FAR?
"oil," in accordance with 14 CFR Part 25.
300
As a general rule, the mixture setting on a reciprocating engine operating at or near takeoff power that provides the best cooling is
Full Rich
300
At cruise RPM, some oil will flow through the relief valve of a gear-type engine oil pump. This is normal as the relief valve is set at a pressure which is
lower than the pressure pump capabilities.
300
The oil used in reciprocating engines has a relatively high viscosity due to
large clearances and high operating temperatures.
and
300
What type of oil do most engine manufacturers recommend for new reciprocating engine break-in?
Straight mineral oil.
300
What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?
Oil pressure relief valve.
400
Some larger reciprocating engines use a compensating oil pressure relief valve to
provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up.
400
The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine?
The scavenger pump outlet and the oil storage tank.
400
Lubricating oils with high viscosity index ratings are oils
in which the viscosity does not vary much with temperature change.
400
What type of oil do most engine manufacturers recommend after new reciprocating engine break-in?
Ashless dispersant oil.
400
What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure (reciprocating engine)?
Oil tank vent.
500
Operating speeds of bearings are used to determine
Proper grade of oil to use in a particular engine
500
High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of
an EP lubricant
500
If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?
The thinnest oil that will stay in place and maintain a reasonable film strength.
and
500
and
are what???
The recommended aircraft engine lubricants
500
Low oil pressure can be detrimental to the internal engine components. However, high oil pressure
should be limited to the engine manufacturer's recommendations.