BAK - Engine & Engine Systems Flashcards
What component of a piston engine provides the chamber for the combustion of the fuel-air mixture?
The cylinders
Is the power generated by the pistons transmitted by the, connecting rod or the rotating engine crank shaft, to the propellor to produce thrust?
Rotating engine crank shaft
What is the engine component that converts the reciprocating “up-and-down” motion of the piston to the rotary motion of the crankshaft?
Connecting Rod
What engine components are housed in the cylinders?
Pistons, Piston Rings, Valves, and Spark Plugs
How many spark plug are housed in each cylinder of a typical recreational piston aircraft?
2
The force due to combustion is transmitted to the connecting rod by which engine component?
Pistons
True or False - One function of the piston rings is to prevent leakage of combustion pressure around the pistons, which would result in a loss of power?
True
In correct order, name the four strokes of a typical 4-cylinder piston engine?
Induction / Intake
Compression
Power
Exhaust
True or False - Each magneto in a dual ignition system ‘fires’ one spark plug in each cylinder
True
Name two advantages of a dual ignition system
Redundancy should one system fail, and
enhanced combustion
What is the power source that provides the ‘spark’ for the ignition system?
The magnetos
What is the power source for the electric starter motor?
The battery
When operating on one magneto, will there be a slight rise or drop in RPM if the magneto is operating properly?
Drop
What is the purpose of the lubrication system?
Reduce friction of engine components and aid cooling but removing heat around engine components
Having determined that the problem is not the selection of an empty fuel tank, what is the likely cause of a low fuel pressure reading?
Engine-driven fuel pump failure
Do high-wing aircraft usually have gravity-fed or pump-fed fuelling systems?
Gravity-fed
What is the purpose of the back-up electric pump associated with pump-fed fuelling systems?
For emergencies in case the engine-driven pump fails, and for starting.
In pump-fed fuel systems, should the back-up electric pump be selected to ON or OFF during take-offs, landings and when switching between tanks?
Selected “ON”
What may a blocked oil cooler result in?
Engine overheating
In what atmospheric conditions are vapour locks in the fuel lines most likely to occur?
Low atmospheric pressure, and high temperatures
What pre-take off action should the pilot take if they suspects “heat-soaking” of the engine?
Do not take-off to quickly after the previous flight, and perform an adequate engine run-up prior to take-off to purge the fuel lines of vapour locks
What is the colour of 110L AVGAS? What is the colour of AVTUR?
110L AVGAS is blue, and
AVTUR is clear.
True or False - Fuels with a lower octane rating are more prone to detonation?
True
What is the term used to describe an oil’s flow properties?
Viscosity
Using fuel higher than the specified grade is likely to result in what?
Spark plug fouling
Do high or low viscosity oils flow more freely?
Low viscosity
Do high or low temperatures increase an oil’s viscosity and therefore make them flow more freely?
High temperatures
True or False - Different grades of single viscosity oil are used depending on whether the temperature is hot or cold?
True
For what purpose are multi-grade oils produced?
So that the one oil can be used in either hot or cold temperatures
True or False - inadequate lubrication is a likely result of using an oil that is higher or lower grade than specified?
True
Name two contaminants of fuel
Any two of the following:
Water,
Solids - rust, dirt, scale,
Incorrect grade of fuel - ie MOGAS, AVGAS, AVTUR,
Chemical additives in incorrect proportions
What is the main advantage of filling the fuel tanks over night?
It reduces the risk of condensation that may occur over night, and it reduces the risk of fire
Is excess oil being burnt in the cylinders indicated by blue or black smoke from the exhaust?
Blue smoke
Does an excess oil level above the specified amount increase the possibility of spark plug fouling or engine overheating?
Spark plug fouling
Before the first flight of the day and after each refuelling, what should the fuel tanks be checked for the presence of?
Presence of water
Does a carburettor sense the weight or volume of air being drawn into the engine?
Volume of air
If a fuel/air mixture is richer than the chemically correct mixture (CCM), would the fuel/air mixture contain more or less fuel than the reference mixture?
More
What is the main disadvantage of recreational aircraft having a carburettor is a carburettor’s susceptibility to XXX?
Engine icing
In an aircraft with a fuel pressure gauge (usually a pump-fed system), is a blocked vent most likely indicated by a sudden or gradual loss of fuel pressure?
Gradual
Will replacing your aircraft with a fine or coarser pitch propellor likely result in an increased take-off distance, a reduced climb performance and an improved cruise performance?
Coarser pitch
Loss of thrust, engine wear and vibration a likely result of a stone-damaged or a coarser pitch propellor?
Stone-damaged propellor
Your aircraft has a back-up electric-fuel pump and upon starting it is apparent that is has failed. Why is it important not to take-off?
Because the electric back-up fuel pump is needed in flight in case the engine-driven fuelpump fails
