Piston 2 - Week 2D
What is CAE 80 Grade oil is equivalent to?
20W50 grade oil
SAE 40 grade oil
SAE 65 grade oil
SAE 30 grade oil
What is the problem with using mineral oil?
Tends to sludge when aerated by agitation
Tends to overly contaminate the combustion chamber
Tends to breakdown when used at low temperatures
Tends to sludge when exposed to contaminants
What is the advantage of using a multi-viscosity oil?
Reduced drag leading to higher cruise speeds
Slower oil flow at low temperatures and lower viscosity at high operating temperatures
Quicker oil flow at low temperatures and higher viscosity at high operating temperatures
Faster flight control movement at all temperature
What kind of pump is a scavenge pump? #1
A centrifugal pump
A piston pump
A diaphram pump
A gear pump
What is done to clean a canister oil filter?
Nothing, the cartridge is disposable
The paper is removed, inspected for contamination, cleaned & reinstalled
The spiral wound metal strip is removed, inspected for contamination, cleaned & reinstalled
The screen is removed, inspected for contamination, cleaned & reinstalled
What is done to clean a Cuno filter?
The spiral wound metal strip is removed, inspected for contamination, cleaned & reinstalled
Nothing, the cartridge is disposable
The screen is removed, inspected for contamination, cleaned & reinstalled
The paper is removed, inspected for contamination, cleaned & reinstalled
Small piston engines will use how many methods of oil distribution?
All of them
One
One or two
Three
What is the primary method of lubrication for internal components (cylinder walls, cam lobes piston pins, accessory gears) in an aircraft piston engine?
Spray lubrication
Diffusion lubrication
Splash lubrication
Pressure lubrication
Which of the following is a purpose for an aircraft engine's oil system? #2
Increasing engine minimum speed
Increasing engine volumetric efficiency
Reducing engine maximum speed
Absorbing heat
When is Mil-L-60823E straight mineral oil used?
As required, whenever oil pressure gets low
For the initial 50 hrs after overhaul for break in
After break in until overhaul
Only during the summer
Why do aircraft piston engines require relatively high viscosity oils?
Low operating temperatures
Large engine clearances due to small parts
Large engine clearances due to large parts
Small engine clearances due to large parts
Large piston engines will use which oil distribution methods?
Vacuum, diffusion and regurgitation
Pressure and diuretic
Pressure, splash and spray
Pressure, splash, spray and diffusion
What is used to return the oil to the tank in a wet sump engine?
Gravity
A scavenge pump
A pressure pump
Air pressure
What happens to the oil as the grade number increases?
The viscosity or thickness decreases
The price goes down
The viscosity or thickness stays the same
The viscosity or thickness increases
Which of the following is a purpose for an aircraft engine's oil system? #3
Increasing engine maximum power
Reducing engine maximum speed
Sealing engine components
Increasing engine thermal efficiency
Which of the following is a purpose for an aircraft engine's oil system? #1
Increasing engine compression ratio
Reducing engine maximum speed
Increasing engine volumetric efficiency
Reducing friction
What is the method of lubrication used in an aircraft piston engine when the 2 main methods are either not possible and not enough (on cylinder walls and camshaft lobes) ?
Splash lubrication
Pressure lubrication
Spray lubrication
Diffusion lubrication
What kind of pump is used to return oil to the sump in an oil lubrication system? #1
A gerotor pump
A diaphram pump
A piston pump
A centrifugal pump
How is lubrication oil pressure adjusted?
By changing the relief valve spring
By changing the oil
By changing the relief valve ball size
By adding or removing spacer washers
What is done to clean a surface filtration filter?
The screen is removed, inspected for contamination, cleaned & reinstalled
The paper is removed, inspected for contamination, cleaned & reinstalled
The spiral wound metal strip is removed, inspected for contamination, cleaned & reinstalled
Nothing, the cartridge is disposable
What is the primary method of lubrication for high load components (crankshaft bearings, connecting rods, camshaft main bearings) in an aircraft piston engine?
Splash lubrication
Pressure lubrication
Diffusion lubrication
Spray lubrication
What is a disadvantage of synthetic oil?
Low viscosity at high temperatures
Breaks down easily at high temperatures
High viscosity at low temperatures
Softens rubber and resin products in the engine
Which of the following is a purpose for an aircraft engine's oil system? #5
Increasing flight control rate of motion
Cleaning
Reducing pilot physical workload
Washing dishes
What is used to return the oil to the tank in a dry sump engine?
A scavenge pump
A pressure pump
Gravity
Air pressure
When are Mil-L-22851D ashless dispersant oils used in an aircraft piston engine?
Only during the summer
After break in until overhaul
They are not used, synthetic oils are used
For the initial 50 hrs after overhaul for break in
What is the primary method used to control lubricating oil pressure?
Engine speed
Manifold pressure
A temperature relief valve
A pressure relief valve
What is the purpose of regular SOAP sampling with an aircraft engine
To monitor internal component wear without disassembly of the engine
To compensate for internal component wear during normal operation
To determine if the engine is failing based on a single sample test
To clean the internal areas of the engine regularly
What is SAE30 grade oil equivilent to?
CAE 80 grade oil
CAE 100 grade oil
CAE 65 grade oil
SAE 20W50 grade oil
Where is a dry sump oil system used?
When high altitude performance is required
On engines with high volumes of oil
On engines with low volumes of oil
On low performance engines
Where is a wet sump oil system used?
On engines with high volumes of oil
On engines with low volumes of oil
On high performance engines
When high altitude performance is required
What is the most common oil filter?
A spin on full flow filter
A Cuno full flow filter
A canister full flow filter
A surface filtration full flow filter
How much of an engine's cooling is provided by oil?
As much as 70%
As much as 30%
As much as 40%
As much as 50%
What is done to clean a spin on oil filter?
The paper is removed, inspected for contamination, cleaned & reinstalled
Nothing, they are disposable
The screen is removed, inspected for contamination, cleaned & reinstalled
The spiral wound metal strip is removed, inspected for contamination, cleaned & reinstalled
Where would a bypass oil filter be installed?
After the pressure regulator, in parallel with the bearings
Before the oil pump
After the pressure regulator, in series with the bearings
Before the pressure regulator
What determines the thickness or viscosity of oil?
The waviness of the surfaces and the clearances between components
The metals used in making the components of the engine
The roughness of the surfaces and the clearances between components
The altitudes that the aircraft will be operated at
What is used to extend the service life of oil in an engine?
Washing
Screening
Filtering
Pre-heating
Why do aircraft piston engines require relatively high viscosity oils?
Small engine clearances due to large parts
Low operating temperatures
High operating temperatures
Large engine clearances due to small parts
Which of the following is a purpose for an aircraft engine's oil system? #4
Cushioning engine parts
Decreasing engine compression ratio
Improving engine mid range torque
Increasing engine frictional losses
What kind of pump is used to provide oil in an oil lubrication system? #1
A gear pump
A centrifugal pump
A diaphram pump
A piston pump
How is lubrication oil pressure adjusted?
By changing the oil
By changing the relief valve ball size
By turning an adjuster screw
By changing the relief valve spring
Which of the following is a purpose for an aircraft engine's oil system? #6
Protecting from corrosion
Improving planned obsolescence
Reducing friction in the flight control system
Accelerating wear and corrosion
When would an oil filter bypass valve be open?
With the engine running and a plugged filter
With the engine running and a clean filter
With the engine stopped and a clean filter
With the engine stopped and a plugged filter
What is CAE 65 Grade oil is equivalent to?
20W50 grade oil
SAE 30 grade oil
SAE 40 grade oil
SAE 65 grade oil
What is a disadvantage of synthetic oil?
Breaks down easily at high temperatures
Low viscosity at high temperatures
Tends to blister paint
High viscosity at low temperatures
Which of the following best describes 20W50 oil?
It behaves like a SAE 20 oil on start up and like a SAE 50 oil at normal operating temperatures
It behaves like a CAE 20 oil on start up and like a CAE 50 oil at normal operating temperatures
It behaves like a SAE 50 oil on start up and like a SAE 20 oil at normal operating temperatures
It behaves like a CAE 50 oil on start up and like a CAE 20 oil at normal operating temperatures
How is engine oil cooled on an aircraft piston engine?
By cooling fins on the oil reservoir
By an oil to air heat exchanger
By an oil to fuel heat exchanger
By evaporative cooling of the oil
What kind of pump is used to return oil to the sump in an oil lubrication system? #2
A piston pump
A centrifugal pump
A gear pump
A diaphram pump
What is SAE50 grade oil equivilent to?
CAE 65 grade oil
CAE 80 grade oil
CAE 100 grade oil
SAE 20W50 grade oil
What happens to the oil as the grade number decreases?
The viscosity or thickness decreases
The viscosity or thickness stays the same
The price goes down
The viscosity or thickness increases
What is a disadvantage of synthetic oil?
High viscosity at low temperatures
Increased sludging tendancey
Low viscosity at high temperatures
Breaks down easily at high temperatures
Where would a full flow oil filter be installed?
After the pressure regulator
Before the pressure regulator
After the bearings
Before the oil pump
Where will the oil be stored in a dry sump system?
In a tank just outside the engine
In a tank inside the radiator
In the bottom of the engine
In a tank in the fuselage
Where is a dry sump oil system used?
When high altitude performance is required
On engines the will be used in extreme aerobatic flight
On low performance engines
On engines with low volumes of oil
What is SAE40 grade oil equivilent to?
SAE 20W50 grade oil
CAE 100 grade oil
CAE 80 grade oil
CAE 65 grade oil
What kind of pump is used to provide oil in an oil lubrication system? #2
A piston pump
A centrifugal pump
A gerotor pump
A diaphram pump
What kind of pump is a scavenge pump? #2
A centrifugal pump
A gerotor pump
A piston pump
A diaphram pump
What is the problem with using mineral oil?
Tends to foam when aerated by agitation
Tends to foam when exposed to contaminants
Tends to breakdown when used at low temperatures
Tends to overly contaminate the combustion chamber
What is the most commonly used type of aircraft piston engine oil?
Mineral based
Synthetic oils
Semi-synthetic oils
Castor oils
Where will the oil be stored in a wet sump system?
In the bottom of the engine
In a tank in the fuselage
In a tank just outside the engine
In a tank inside the radiator
What is CAE 100 Grade oil is equivalent to?
20W50 grade oil
SAE 30 grade oil
SAE 40 grade oil
SAE 50 grade oil
Why do aircraft piston engines require relatively high viscosity oils?
High bearing pressures
Low operating temperatures
Small engine clearances due to large parts
Large engine clearances due to small parts
Why is ashless dispersant oil better?
It contains dispersants that will prevent sludge formation
It contains anti-wear and anti-foaming additives
It does not generate ash that will contain metal particles
All of the above
What is the purpose of the oil suction screen?
To remove large particles that could damage the pump
To remove large particles that could damage the main filter
To remove small particles that could damage the pump
To remove small particles that could damage the main filter
When is the Lycoming suction screen typically serviced?
At TBO
At overhaul
Every oil change
Every 10 years
What is an oil dilution system used for?
To decrease oil viscosity for cold weather starting
To decrease oil viscosity for hot weather starting
To increase oil viscosity for hot weather starting
To increase oil viscosity for cold weather starting
What is added to the oil in an oil dilution system?
Avgas
Jet A
Diesel
Hydraulic fluid
Where will the oil drain be located?
On the oil filter
On the top of the sump
On the oil pump
On the bottom of the sump
What should you do before installing an upside down oil filter?
Nothing, just put it in
Fill it with fuel
Fill it with fresh oil
Fill it with old oil
Where is the oil pressure measured with a wet gauge?
In the gauge in the instrument panel
In a transducer mounted on the engine
In a transducer mounted near the engine
In the gauge in the engine nacelle
What size lockwire is used to safety an oil filter?
.032"
.020"
.025"
.040"
What kind of contaminants are we concerned about in an oil filter?
Dirt
Metal particles
Carbon
Fuel
What will a wet gauge have on the engine to protect from oil leaks?
A surge valve
A pressure relief valve
A vernatherm
A restrictor fitting
What is typically used to pre-heat an engine in cold weather operations?
Natual gas fueled hot air blower system
A gasoline fueled hot air blower system
Electric heaters
A propane fueled hot air blower system
What happens to the fuel that was added to the oil in an oil dilution system?
Nothing, it just stays there
It is burned off once the engine warms up
It evaporates once the engine warms up
It freezes once the engine warms up
What component controls oil temperature?
The oil cooler
The surge valve
The vernatherm
The throttle
When taking an oil sample why should you wait for approx 1/2 quart to drain from the tank first?
To make sure you get a sample of the fuel diluted oil
To allow excess sediment to flow out first
To make sure you catch the excess sediment
To allow the fuel diluted oil to drain first
Where is the suction screen located?
After the oil pump and before the pressure relief valve
Between the filter and the main bearings
After the oil pump and before the filter
Before the oil pump
How often will the oil pressure need to be adjusted?
Rarely, consult the MM
Every oil change
Rarely, consult the IPC
When ever necessary
What is used to lubricate the seal on a new oil filter?
New hydraulic fluid
Clean water
New fuel
New engine oil
What is used to make cold weather starting easier on some aircraft engines?
An engine pre-heater on the oil sump and crankcase
An engine pre-heater on the cylinders, oil sump and crankcase
An engine cooler on the cylinders, oil sump and crankcase
An engine pre-heater on the cylinders, crankcase and accessory housing
Where is the oil pressure measured with pressure transducer?
In the gauge in the instrument panel
In a transducer mounted near the engine
In the gauge in the engine nacelle
In a transducer mounted on the instrument panel
What component reduces the oil temperature?
Oil cooler
Cuno filter
Cylinders
Vernatherm
How can you tell what kind of metal particles are in a filter?
By density and location
By age and colour
By colour and magnetic properties
By colour and density
What does a vernatherm do?
As it warms up it closes, forcing all oil to bypass the main bearings
As it warms up it opens, allowing oil to bypass the main bearings
As it warms up it closes, forcing the oil through the oil cooler
As it warms up it opens, forcing the oil through the oil cooler
What does a surge valve do?
It works like an accumulator, protecting the oil filter from shock
It works like an accumulator, protecting the oil pump from shock
It works like an accumulator, protecting the oil cooler from shock
It works like an accumulator, protecting the oil sump from shock
What is an oil separator used for?
To remove oil droplets from the air pump outlet and return them to the engine
To remove oil droplets from the exhaust and return them to the engine
To remove oil droplets from the fuel and return them to the engine
To remove oil droplets from the air pump inlet and return them to the engine
How tight should an oil filter be tightened when installing?
It should be tightened finger tight plus 1/4 turn
It should be tight
It should be tightened finger tight plus 1/6 turn
It should be torqued to specs
What is done to disposable oil filters before throwing them away?
They are cut open, drained and inspected for metal contamination
They are permanently marked so they cannot be reused
They are crushed to reduce their size
They are drained of oil to reduce environmental impact
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