Piston 1 - Week 5
What is causes fuel flow in a carburetor?
The pressure difference between the exhaust system pressure and the turbocharger outlet pressure
The metering jet due to changes in fuel pump outlet pressure
The fuel pump
The pressure difference between the inside and the outside of the venturi
Which of the following propellers cannot be adjusted?
Constant speed
Fixed pitch
Feathering
Ground adjustable
Which of the following best describes a ground adjustable propeller?
Can be adjusted on the ground for optimum efficiency at a specific rotational and forward speed
Can be pilot adjusted to achieve best performance for a given flight condition
Can be re-configured to reduce all possible drag
Will automatically adjust to hold the desired propeller RPM
What are propeller blades shaped like?
Wings
UFO's
Cylinders
Flat plates
How is an engine's speed controlled?
By the use of a choke valve before the air filter to limit airflow into the induction system
By use of a throttle plate to limit airflow into the induction system
By the use of a fuel metering valve to control fuel flow into the engine
By use of a throttle plate to limit airflow out of the exhaust system
What is the purpose of an exhaust system?
To reduce engine emissions
To poison the pilot, crew and passengers
To improve engine performance
To reduce noise
Why were turbo/superchargers first installed on aircraft?
To reduce/eliminate the engine power loss as the aircraft climbs into more dense air
To increase the maximum speed that the engine can produce power at
To improve fuel efficiency and reduce maintenance costs
To reduce/eliminate the engine power loss as the aircraft climbs into less dense air
How does an Magnesyn measure fuel flow?
By monitoring the rotation of a turbine in the flowmeter
By monitoring the position of a vane in the sender unit
By monitoring fuel pressure at the spider valve or flow divider
It doesn't , Magnesyn is part of the navigation system
What is the purpose of regular SOAP sampling with an aircraft engine
To monitor internal component wear without disassembly of the engine
To determine if the engine is failing based on a single sample test
To clean the internal areas of the engine regularly
To compensate for internal component wear during normal operation
What are the disadvantages of a wooden propeller?
Hard, abrasion resistant
Moisture sensitive
Heavy, prone to resonance
Low maintenance, durable
What are the disadvantages of a wooden propeller?
Heavy, prone to resonance
Low maintenance, durable
Soft, easy to crush
Hard, abrasion resistant
What is used to connect an electric tachometer to the engine?
Magnetism
Fibre optics
Wires
A flexible drive cable
What are the 4 types of speed indicating instruments?
Mechanical, magnetic, electric, quantum
Wheatstone bridge, ratiometer, vapour pressure type, thermocouple type
Mechanical, magnetic, electric, electronic
Mechanical, magnetic, electric, photonic
What is the purpose of the induction system?
To extract sulfur
To take waste gasses from the engine and get rid of them safely
To provide clean oil to the engine
To provide clean air & fuel to the cylinders
What are the major parts of the fuel injection system?
Fuel pump, float, bowl, fuel nozzle, venturi, throttle plate, accellerator pump, idle system
Fuel pump, throttle body, fuel metering unit, spider valve & fuel nozzles
Fuel pump, float, bowl, fuel nozzle, venturi, throttle plate
Fuel pump, throttle body, bowl & float, spider valve & fuel nozzles
What are the disadvantages of "hand propping" an aircraft engine?
Personal safety and more viscous oil in warm weather
Personal safety and more viscous oil in cold weather
There are no disadvantages
Personal safety and a shortage of bears to hand prop in cold weather
What is CAE 100 Grade oil is equivalent to?
20W50 grade oil
SAE 30 grade oil
SAE 40 grade oil
SAE 50 grade oil
What is CAE 80 Grade oil is equivalent to?
20W50 grade oil
SAE 30 grade oil
SAE 65 grade oil
SAE 40 grade oil
What are the types of induction system in an aircraft piston engine?
Carbureted, fuel injected, direct injection
Direct injection, fuel injection & continuous combustion
Carbureted, fuel injected, turbo & supercharged
Four stroke, two stroke & diesel
What is the advantage of using a multi-viscosity oil?
Quicker oil flow at low temperatures and higher viscosity at high operating temperatures
Reduced drag leading to higher cruise speeds
Slower oil flow at low temperatures and lower viscosity at high operating temperatures
Faster flight control movement at all temperature
What is used to connect a magnetic tachometer to the engine?
A flexible drive cable
Fibre optics
Magnetism
Wire
What is used to connect a mechanical tachometer to an engine?
Fibre optics
Magnetism
A flexible drive cable
Wire
What were the first propellers generally made of?
Wood
Composites
Aluminum
Steel
What is a disadvantage of a wooden propeller?
Heat will cause significant span/chord changes
Moisture will change balance, size and shape
Torque will cause significant sweep back of the blades
Centrifugal force will cause propeller length changes
What is SAE30 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 increases
The viscosity or thickness stays the same
The viscosity or thickness decreases
The price goes down
What else must be controlled as the air into the engine is controlled?
Oil flow into the engine
Fuel flow into the engine
Hydraulic flow into the engine
Exhaust flow out of the engine
What is the purpose of an exhaust system?
To reduce engine emissions
To improve engine performance
To carry engine gasses overboard safely
To poison the pilot, crew and passengers
What is the purpose of a turbo or supercharger?
To eliminate the need for a carburetor or fuel injection system
To decrease volumetric efficiency, to decrease the amount of air/fuel going into the engine
To increase volumetric efficiency, to increase the amount of air/fuel going into the engine
To increase thermal efficiency and reduce emissions
What are the advantages of a fuel injection system over carburetion?
Faster combustion and lower emissions
Ease of adjustment and maintenance
Simplicity and reliability
More even air/fuel mixture distribution and reduced icing
What is the purpose of the venturi in a simple carburetor?
To create a low pressure region at the nozzle that will draw fuel through a nozzle to spray into induction air
To create a high pressure region at the nozzle that will push fuel through a nozzle to spray into induction air
To create a low pressure region in the fuel bowl that will draw fuel through a nozzle to spray into induction air
To create a motive flow for the engine's oil system
What does the RSA fuel injection system use to control fuel flow into the engine?
The difference between the fuel pump speed and the engine speed
Air pressure differences between inside and outside the venturi
Fuel pressures
Fuel & air pressures
What does a series wound DC motor produce?
High starting torque
Engine pre-heat
Low starting torque
High starting rpm
To measure oil pressure what kind of gauge would be used?
Bourdon tube type
Diaphragm type
Aneroid bellows type
Wheatstone bridge type
When are Mil-L-22851D ashless dispersant oils used in an aircraft piston engine?
They are not used, synthetic oils are used
Only during the summer
After break in until overhaul
For the initial 50 hrs after overhaul for break in
What is the purpose of a propeller?
To convert engine power into noise
To convert engine power into lift
To convert engine power into drag
To convert engine power into thrust
What is the primary method of lubrication for internal components (cylinder walls, cam lobes piston pins, accessory gears) in an aircraft piston engine?
Splash lubrication
Diffusion lubrication
Pressure lubrication
Spray lubrication
What are the major disadvantages of a carbureted induction system?
The inability to be used inverted and Icing
Greater complexity and lower reliability
Uneven fuel/air mixture distribution to the cylinders and icing
Excessive temperatures of the fuel/air mixture delivered cylinders and detonation
What is the largest problem encountered in an induction system?
Congestion
Ice cream
Ice formation
Dirt build up
What is SAE50 grade oil equivilent to?
CAE 80 grade oil
CAE 100 grade oil
SAE 20W50 grade oil
CAE 65 grade oil
What is CAE 65 Grade oil is equivalent to?
SAE 30 grade oil
20W50 grade oil
SAE 65 grade oil
SAE 40 grade oil
How does a pressure type fuel flow gauge measure flow?
By monitoring fuel pressure at the fuel metering unit input
By monitoring fuel pressure at the spider valve or flow divider
By monitoring fuel pressure at the fuel pump inlet
By monitoring fuel pressure at the fuel pump outlet
What is a baffle inside the muffler of an aircraft engine?
A plate or tube with holes drilled in it to slow down gas flow or absorb noise
Something used to confuse and delay the crew
A clip used to hold the parts of the muffler together
A plate with rubber seals around it used to control cooling airflow around the engine
Why are ratiometer type meters preferred in aircraft
They have no moving parts and are resistant to vibration and shock
They have no moving parts
They are resistant to vibration and shock
They are not power supply sensitive and are very accurate
Which of the following best describes 20W50 oil?
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 20 oil on start up and like a CAE 50 oil at normal operating temperatures
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 50 oil on start up and like a CAE 20 oil at normal operating temperatures
What were the advantages of a steel propeller?
Strong, fatigue resistant, flexible
Light, durable, vibration resistant
Heavy, vibration absorbing, flexible
Strong, durable, abrasion resistant
What are the disadvantages of a steel propeller?
Poor abrasion resistance
Prone to fatigue, corrosion
Heat sensitivity
Soft, easy to crush
Small piston engines will use how many methods of oil distribution?
One
Three
All of them
One or two
Which of the following best describes a fixed pitch propeller?
Will automatically adjust to hold the desired propeller RPM
Can be pilot adjusted to achieve best performance for a given flight condition
Can be re-configured to reduce all possible drag
Produces optimum efficiency at a specific rotational and forward speed
To measure low to medium pressures what kind of gauge would be used?
Diaphragm type
Wheatstone bridge type
Aneroid bellows type
Bourdon tube type
What is an advantage of a composite propeller?
Light weight
Flexible
Soft
Heavy
When is Mil-L-60823E straight mineral oil used?
Only during the summer
After break in until overhaul
As required, whenever oil pressure gets low
For the initial 50 hrs after overhaul for break in
What is the most popular method of starting aircraft piston engines?
Parallel wound DC motor
Hand propping
Hand cranked inertia starter
Series wound DC motor
What components are used in a simple exhaust system?
Exhaust pipes, muffler & turbocharger
Exhaust pipes, turbocharger & waste gate
Exhaust pipes and muffler
Exhaust pipes, muffler, turbocharger & waste gate
What is SAE40 grade oil equivilent to?
CAE 80 grade oil
CAE 100 grade oil
SAE 20W50 grade oil
CAE 65 grade oil
What is the most commonly used type of aircraft piston engine oil?
Synthetic oils
Mineral based
Semi-synthetic oils
Castor oils
Large piston engines will use which oil distribution methods?
Pressure and diuretic
Pressure, splash and spray
Vacuum, diffusion and regurgitation
Pressure, splash, spray and diffusion
To measure manifold pressure what kind of gauge would be used?
Aneroid bellows type
Wheatstone bridge type
Bourdon tube type
Diaphragm type
What are the advantages of a wood propeller?
Light, vibration absorbing, infinite fatigue life
Strong, fatigue resistant, flexible
Strong, durable, abrasion resistant
Heavy, vibration absorbing, flexible
What are the disadvantages of a wooden propeller?
Hard, abrasion resistant
Low maintenance, durable
Heavy, prone to resonance
Poor abrasion resistance
What was the big improvement in reliability between electric and magnetic trachometers?
There was no difference in reliability
The tach generator is more reliable than the drive cable connector
Wires are more reliable than drive cables
The electric tach gauge is more reliable than the magnetic one
Which of the following best describes a reversible propeller?
Can change the colour of the blades with the changing of a switch in the cockpit
Can change the blade angles to produce "negative thrust"
Can be installed in two directions (frontwards & backwards) to extend service life due to abrasion
Can be turned backwards to produce "negative thrust"
Which of the following propellers can be used to stop the aircraft after landing?
Controllable pitch
Reversible
Constant speed
Fixed pitch
What is a disadvantage of a steel propeller?
Heat sensitivity
Poor abrasion resistance
Soft, easy to crush
Heavy
What happens to the oil as the grade number increases?
The viscosity or thickness stays the same
The viscosity or thickness decreases
The price goes down
The viscosity or thickness increases
What is the minimum number of fuel pumps needed in a low wing aircraft with a carbureted piston engine ?
One, an engine driven pump
Two, an engine driven pump and and electric emergency pump
None, gravity will do all that work for us
An engine driven pump and a fuel pump in each fuel tank
To measure low pressures what kind of gauge would be used?
Bourdon tube type
Diaphragm type
Aneroid bellows type
Wheatstone bridge type
What is the purpose of the venturi in a simple carburetor?
To create a motive flow for the engine's oil system
To create a low pressure region in the fuel bowl that will draw fuel through a nozzle to spray into induction air
To create a low pressure region at the nozzle that will draw fuel through a nozzle to spray into induction air
To create a high pressure region at the nozzle that will push fuel through a nozzle to spray into induction air
What is an advantage of a composite propeller?
Heavy
Soft
Flexible
Vibration absorbant
What is an advantage of a composite propeller?
Heavy
No fatigue limits
Flexible
Soft
Which of the following propellers can the pilot change in flight?
Controllable pitch
Fixed pitch
Ground adjustable
What components are used in a turbocharged exhaust system?
Exhaust pipes, muffler, turbocharger & waste gate
Exhaust pipes, muffler & turbocharger
Exhaust pipes, turbocharger & waste gate
Exhaust pipes and muffler
What was the big improvement comparing mechanical to magnetic tachometers?
There was no improvement
Reliability in the connection between the engine and the gauge
Reliability in the drive
Reliability in the gauge
What are the problems with using a wheatstone bridge to measure temperature?
Only good for low temperatures and sensitive to vibration
Low temperature capability and accuracy issues when the power supply changes
Only good for high temperatures and sensitive to vibration
Low accuracy and only good for high temperatures
What is used in a carburetor to keep the fuel level constant?
The float valve
The metering jet
The fuel pump
The fuel tank location
What is the big advantage of a Magnesyn fuel flow system?
It compensates for temperature and volume to measure voluem flow
It compensates for temperature and volume to measure mass flow
It compensates for temperature and pressure to measure mass flow
It compensates for pressure and volume to measure mass flow
What is an advantage of a composite propeller?
Moisture sensitivity
Heavy
Disposable
Repairable
When/how long can carburetor/induction heat be used?
In the air for unlimited time/on the ground for unlimited time
In the air for unlimited time/on the ground for short periods of time
In the air for short periods of time/on the ground for unlimited time
In the air for short periods of time/on the ground for short periods of time
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) ?
Pressure lubrication
Diffusion lubrication
Spray lubrication
Splash lubrication
What is the minimum number of fuel pumps needed in a high wing aircraft with a carbureted piston engine?
Two, an engine driven pump and and electric emergency pump
An engine driven pump and a fuel pump in each fuel tank
One, an engine driven pump
None, gravity will do all that work for us
Which of the following best describes a constant speed propeller?
Will automatically adjust to hold the desired propeller RPM
Can be re-configured to reduce all possible drag
Can be pilot adjusted to achieve best performance for a given flight condition
Produces optimum efficiency at a specific rotational and forward speed
What techniques are used in an electronic tach system?
Monitor drive cable position optically or by magnetic variations
Optically by counting the number of blades on the propeller that pass in front of the pilot
Monitor P-lead voltage or by magnetic flux changes
By monitoring the reflection of laser beams off the propeller blade faces
How does an Autosyn measure fuel flow?
By monitoring fuel pressure at the spider valve or flow divider
It doesn't , Autosyn is part of the navigation system
By monitoring the rotation of a turbine in the flowmeter
By monitoring the position of a vane in the sender unit
Which is the most popular type of temperature measurement system on an aircraft engine?
Wheatstone bridge type
Ratiometer
Thermocouple
Vapour pressure type
What is used to keep both turbochargers in a dual turbocharger system turning close to the same speed?
The turbocharger control system monitors speeds and adjusts both waste-gates to control speed
The turbochargers are connected in series to prevent speed differences
You don't need to worry about this, the design of the system prevents major speed differences
Cross-over pipes
What causes the temperature drop in the induction system?
The air dis-obeys the general gas laws and sublimation of the fuel
The air obeys the general gas laws and freezing of the fuel
The air obeys the general gas laws and vaporization of the fuel
The air obeys the general gas laws and boiling of the fuel
What does the Continental fuel injection system use to control fuel flow into the engine?
Fuel pressures
Air pressure differences between inside and outside the venturi
The difference between the fuel pump speed and the engine speed
Fuel & air pressures
What does a starter circuit use to protect the wires in it?
Fuses
Thermometers
Circuit breakers
Nothing
Which of the following is a purpose for an aircraft engine's oil system?
Decreasing engine compression ratio
Increasing engine frictional losses
Improving engine mid range torque
Cushioning engine parts
What is the primary method of lubrication for high load components (crankshaft bearings, connecting rods, camshaft main bearings) in an aircraft piston engine?
Spray lubrication
Splash lubrication
Pressure lubrication
Diffusion lubrication
When ice formation is encountered in the induction system what is done about it?
Induction air heat is turned on automatically to melt it
Induction air heat is turned on by the crew to melt it
Nothing, it does not matter
Induction air cooling is turned on by the crew to dry the air before use
Which of the following is a purpose for an aircraft engine's oil system?
Washing dishes
Cleaning
Reducing pilot physical workload
Increasing flight control rate of motion
Which of the following best describes a controllable pitch propeller?
Will automatically adjust to hold the desired propeller RPM
Can be re-configured to reduce all possible drag
Produces optimum efficiency at a specific rotational and forward speed
Can be pilot adjusted to achieve best performance for a given flight condition
To measure high pressures what kind of gauge would be used?
Diaphragm type
Wheatstone bridge type
Aneroid bellows type
Bourdon tube type
If a vapour pressure type gauge fails which part do you replace?
The gauge
The line between the sensing bulb and the gauge
Everything in the system
The sensing bulb
Which of the following is a purpose for an aircraft engine's oil system?
Improving planned obsolescence
Reducing friction in the flight control system
Protecting from corrosion
Accelerating wear and corrosion
What is used to connect an electronic tachometer to the engine?
A flexible drive cable
Fibre optics
Wire
Magnetism
Which of the following is a purpose for an aircraft engine's oil system?
Reducing friction
Reducing engine maximum speed
Increasing engine volumetric efficiency
Increasing engine compression ratio
What is an advantage of a composite propeller?
Soft
Heavy
Durable
Flexible
Which of the following is a purpose for an aircraft engine's oil system?
Sealing engine components
Increasing engine thermal efficiency
Increasing engine maximum power
Reducing engine maximum speed
What is the simplest type of propeller?
Feathering
Constant speed
Controllable pitch
Ground adjustable
What are the advantages of an aluminum proppeller?
Light, soft & flexible
Heavy, durable and flexible
Strong, durable & corrosion resistant
Strong, flexible & soft
Which of the following is a purpose for an aircraft engine's oil system?
Reducing engine maximum speed
Increasing engine volumetric efficiency
Absorbing heat
Increasing engine minimum speed
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