Lubricating systems: Recip and Turbine Flashcards
Six functions of the lubricating system in a reciprocating system
Reduce friction Seals and Cushions Removes heat Cleans the inside of the engine Protests against corrosion Preforms hydraulic action
When two surfaces are separated by a film of oil, the only friction between the parts is the __________ of the oil.
Internal friction
Most of the heat in a reciprocating engine comes from the __________ and the __________.
Piston
Cylinder walls
The underside of the piston head is __________ to increase the surface area from which the oil can absorb heat.
Finned
The oil that absorbs heat from the cylinder walls is oil that has been sprayed from the crankshaft at the __________.
Connecting rod bearings
When an engine remains out of service for an extended period of time, the cylinder walls should be protected with a special __________.
Preservative oil
Four basic lubricants used to reduce friction between moving parts are:
Animal
Vegetable
Mineral
Synthetic
One of the problems with using animal-based lubricants in aircraft engines is that the become __________ at high temperatures.
Chemically unstable
Two bases used in aircraft engines are:
Paraffinic
Naphthenic
Six types of oil that are of or have been used in aircraft engines are:
Straight mineral Metallic-ash detergent Ashless-dispersant Multiviscosity Synthetic Semisynthetic
The type of oil recommended by most engine manufactures for use during initial break-in periods is __________ oil.
Straight mineral
Detergent oils __________ (are/are not) one of the more popular lubricants for use in modern aircraft engines.
Are not
The most popular lubricating oil for use in aircraft engines is a/an __________ oil.
Ashless dispersant
The measure of opposition of a liquid to flow is called its __________.
Viscosity
The measure of the relationship between the change in viscosity of a liquid to a change in temperature is the __________ of the liquid.
Viscosity index
An oil with a high viscosity index changes its viscosity very __________ with a change in tempreture.
Little
A multiviscosity oil is one that has a/an __________ additive mixed with it.
Viscosity index improver
Two advantages of synthetic oil for use in reciprocating engines are:
Superior resistance to oxidation
Low internal friction
The type of lubricant needed when there is high tooth pressure, or a high rubbing velocity is a/an __________ lubricant.
Extreme pressure
Heat that is picked up from inside the engine is given up to the outside air that passes through the __________.
Oil cooler
It __________ (is/is not) a recommended procedure to mix automotive oil with aviation oil if they have the same SAE number.
Is not
It ___________ (is/is not) a recommended procedure to use turbine engine oil in a reciprocating engine
Is not
The number of seconds required for exactly 60 cubic centimeters of a heated oil to flow through a calibrated orifice in a viscosimeter is the __________ of the oil at that temperature.
SSU viscosity
The SSU viscosity of a lubricating oil as measured at 210 degrees F is used as the basis for the __________ rating of the oil.
Commercial aviation
Two types of lubricating systems based on the oil supply storage are:
Wet sump
Dry sump
The oil supply is carried inside an engine in a __________-sump engine
Wet
The oil pump in a dry sump engine that has the greater capacity is the __________ pump.
Scavenger
The oil cooler in a dry sump engine is installed between the __________ and ___________.
Scavenger pump
Oil tank
The oil tank in a dry sump engine is vented to the outside air through the__________.
Crank case
The crankcase of a reciprocating engine is vented to outside air through a/an __________.
Breather
The wrist pins are lubricated by __________ lubrication
Spray
The desired oil pressure in an engine lubricating system is maintained by a __________.
Pressure relief valve
When oil temperature is low the thermostatic bypass valve is ___________.
Open
Oil is used to lubricate rocker arms and valve stems is carried to the rocker boxes through hollow __________.
Push rods
The oil pump used in an aircraft reciprocating engine is a __________-displacement pump
Constant
Two types of oil pumps used in reciprocating engine lubricating systems are:
Spur gear
Gerotor
In a spur gear oil pump, the oil moves through the pump __________ the gears.
Around
A gerotor pump, __________ (is/is not) a type of gear pump.
Is
SAE 40 engine oil has the same viscosity of commercial aviation grade __________ oil.
80
An ideal engine lubricating oil is one with as __________ a viscosity as possible consistent with high film strength.
Low
The temperature which an oil gives off enough vapors to ignite in a flash but not continue to burn when a small flame is passed above it, is called the __________ of the oil
Flash point
The temperature at which wax first become visible in an oil is called the __________ of oil
Cloud point
A constant displacement oil pump __________ (does/does not) require a pressure relief valve.
Does
When the pressure produced by an oil pump is greater than that held by the pressure relief valve, the excess oil is returned to the __________.
Sump
When the clearance between the bearings in a reciprocating engine increases due to wear, the oil flow through the bearings increases. the outer volume of the pump __________ (does/does not) increase to provide greater flow.
Does not
A compensated oil relief valve uses a thermostatic valve to __________ the oil pressure when the oil is cold.
Increase
The initial setup of an oil pressure relief valve for a newly overhauled engine is made in the __________.
overhaul shop
A surge protection valve in a large engine oil cooler protects the oil cooler from damage when the oil is too __________
Cold
The oil tank used with a dry sump lubrication systerm is vented to the outside air through the engine __________.
Crank case
the oil warm up time for an engine having a large volume oil tank is increased by having a/an __________ installed inside the tank.
Hopper
When an aircraft is operated in extremely cold weather conditions, the oil may be diluted with __________ to make the engine easy to start.
Gasoline
When engine oil that has been diluted with gasoline warms up, the gasoline is removed by __________.
Evaporation
Two basic types of oil filter arrangements are:
__________
__________
Full flow
Bypass
Oil tanks equipped with a Hydromatic feathering propeller have two outlets foe the oil. the outlet at the bottom of the tank goes to the __________.
Propeller feathering pump
The more common type of oil filter arrangement used in aircraft reciprocating engines is the __________ filter.
Full flow
The size of contaminates that can be trapped by a Cuno filter is determined by the thickness of the
Spacers
Most modern aircraft reciprocating engines use __________ oil filters
Disposable
Two instruments relating to the engine lubrication system required for an air-cooled aircraft engine are:
__________
__________
Oil pressure gauge
Oil temperature gauge
Pulsations in the oil pressure gage indication are minimalized by the use of a/an __________ in the oil line to the engine.
Restricted fitting
The oil pressure line between the engine and the oil pressure gage is filled with __________ or ___________.
Light weight oil
Kerosine
Most electrical oil temperature measuring instrument are of the ___________ type.
Resistance change
The oil temperature shown on the instrument in the cockpit is the temperature of the oil as it __________ the engine.
Enters
