LUBRICATION SYSTEMS EXAM QUESTIONS AND
WELL ELABORATED ANSWERS
List five functions of the oil in an engine lubrication system. - answers Cools, Cleans,
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seals and cushions, prevents corrosion, and reduce friction.
The resistance of an oil to flow is known as its ________. - answers Viscosity.
Oil that flows freely has a ____ viscosity. - answers Low.
The oil used in reciprocating engines has a relatively _____ (high or low) viscosity. -
answers High.
The measure of the change in viscosity with a given change in temperature is know as
the ______ ________. - answers Viscosity index.
An engine lubricating oil whose viscosity changes very little for a given change in
temperature has a _______ viscosity index. - answers High.
The point at which liquid will begin to give off ignitable vapors is known as the _______
point. - answers Flash.
Aviation 80 engine oil has the same viscosity as SAE ____ - answers 40
The use of straight mineral oil in aircraft reciprocating engines is associated with what
conditions? - answers New/newly overhauled engines and older engines.
The lubricating properties of straight mineral oil _______ (are/are not) as good as those
of ashless dispersant oil. - answers Are not.
Synthetic lubricating oils are ______ (multi or single) viscosity oils. - answers Multi
If incompatible oil has been added to a turbine engine, it is often necessary to _____
and ______ the oil system before refilling with the proper oil. - answers Flush and refill.
Turbine engine oils ______ (do or do not) use a standard identification system. -
answers Do not.
SAE numbers _____ (are or are not) used to identify turbine oils. - answers Are not.
Two types of lubricating systems for reciprocating aircraft engines are _________ and
___________. - answers Wet sump and dry sump.
The lubricating is distributed to the parts of a reciprocating engine by these three
methods: - answers Pressure, Splash, and combination (spray).
The main disadvantages of a wet-sump engine are: - answers Size is limited, cooling
is less efficient, and temperature is higher.
What two markings must be on the oil filler cap? - answers Oil, and the tank capacity.
Oil tanks used on engines equipped with hydromatic propellers will feed the pressure
pump from a stand-pipe, leaving a reserve of oil for _________ _________. - answers
Propeller Feathering.
A gear-type oil pump is a ______ (constant or variable) displacement pump. - answers
Constant.
Constant-displacement oil pumps ______ (do or do not) require a relief valve to control
their output pressure. - answers Do.
The two types of oil filter systems are: - answers Full flow, and bypass.
In the ____ (full-flow or by-pass) filter system, only a portion of the oil is filtered each
time it circulates. - answers By-pass.
The most popular filter in common use for general aviation aircraft is the disposable
________ (surface of semi-depth) filter. - answers Semi-depth.
The Cuno filter is an _____ (edge or depth) filtration type oil filter. - answers Edge.
The _____ _______ (flow control or surge protection) valve determines which of the
two possible paths the oil will take through a cooler. - answers Flow control.
When the oil is cold, it flows _____ (through or around) the core of the oil cooler. -
answers Around.
___ ________ is a system installed on some reciprocating engines to aid in cold
weather starting by introducing fuel into the oil system prior to shutdown. - answers Oil
Dilution.
Oil pressure is measured at the _____ (inlet or outlet) of the engine driven oil pump. -
answers Outlet.
The 6 main contaminants found in used engine oil are: - answers Gasoline, moisture,
acids, dirt, carbon, and metallic particles.
Oil coolers are normally removed and thoroughly cleaned and inspected at ____
_______ (what event) - answers Engine Overhaul.
The oil pressure on engines used an adjustable oil pressure relief may be increased by
turning the adjustment screw ___________ (clockwise or counter-clockwise) - answers
Clockwise.
Oil consumption in turbine engines is ____ (lower or higher) than that in reciprocating
engines. - answers Lower.
Most turbine engines use ______ (what type) lubricating oil. - answers Synthetic.
Most gas turbine engines for aircraft use a _____ (wet or dry) sump oil system. -
answers Dry.
Turbine engine oil tanks must have an expansion space of ___ % or 0.5 gallon,
whichever is greater. - answers 10%
Two methods of determining the amount of oil in a dry-sump system oil tank are: -
answers Sight gauge and dip stick.
Three types of oil pumps used with a turbine engines are: - answers Vane, Gear, and
Gerotor.
The gerotor pump is considered a ______ (positive or variable) displacement pump. -
answers Positive.
One micron = ________ inch - answers 0.000039.
Three types of main system oil filters used with turbine engines are: - answers
Disposable paper, cleanable screen, screen and spacer.
Fine mesh screens called ____ _____ filters strain the oil just before it is sprayed onto
the bearing surfaces of a turbine engine. - answers Last chance.
Check valves in the oil supply lines prevent accumulations of oil in the _________
________ (what area) of the engine while the engine is not operating. - answers
Accessory gearbox.
The cockpit oil pressure gauge measures the pressure ______ (upstream or
downstream) of the main oil filter. - answers Downstream.
The location of the oil temperature sensor in a turbine engine ____ (does or does not)
make a significant difference in readings. - answers Does not.
If the oil cooler is located in the pressure subsystem of a gas turbine engine, the engine
uses a ___ (hot or cold) tank lubrication system. - answers Hot.
Two types of oil coolers used with aircraft gas turbine engines are: - answers Air and
Fuel.
If turbine oil is observed to be dark brown or blackish with little or no contaminants
present, it is probably caused by a chemical reaction to _____. - answers Heat.
Oil pressure adjustments on turbine engines are usually made while the engine is
_____ (idling or at 75% rated thrust). - answers Idlin [Show Less]