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WorksheetsCPL Acft Tech - Lubrication & cooling systems
Total questions: 20
Worksheet time: 10mins
Select the main functions of oil in an engine
lubrication
cooling
cleaning
anti-knock
True or False?
A wet sump oil system does not have a separate oil storage tank.
True
False
As the temperature of oil increases...
its viscosity increases and it flows more readily
its viscosity decreases and it flows more readily
its viscosity increases and it flows more slowly
its viscosity decreases and it flows more slowly
The type of oil used in an aircraft engine is...
ashless dispersant
mineral
detergent
straight 80
A disadvantage of detergent oils is that they...
form metallic ash compounds
have a low boiling point
are prone to oxidation
have a high viscosity
A disadvantage of mineral oils is that they...
form metallic ash compounds
have a low boiling point
are prone to oxidation
have a high viscosity
An oil with an SAE rating of 40 will have a commercial aviation number of...
20
40
60
80
In an oil system, a pressure relief valve is incorporated so that...
oil is maintained at a constant pressure in the system
if the oil filter becomes blocked, it can be bypassed
if the oil cooler becomes blocked, it can be bypassed
The most likely cause of a high oil pressure is...
a faulty pressure relief valve
an engine fire
low oil temperature
high oil temperature
If the oil pressure falls gradually, and the oil temperature rises, this is an indication that...
the oil system is losing oil
there is a slow but developing engine fire
the pressure relief valve is stuck open
the bypass valve is stuck open
The hottest part of an engine will be the
cylinder head
crankshaft
camshaft
induction manifold
Without any cooling of an engine, temperatures would increase and...
detonation would occur
the mixture would become too rich
the mixture would become too lean
airspeed would increase
Which of the following are parts of a typical engine cooling system, as found on Alpha, Tomahawk and Warrior aircraft?
Select all which apply
baffles
ducts
fins
pump
To assist in cooling, some aircraft (usually those with larger engines) are fitted with...
cowl flaps
Fowler flaps
split flaps
plain flaps
For aircraft which are super or superturbocharged, what is usually fitted to the engine specifically to counter a disadvantage of super/turbocharging?
intercooler
oil cooler
cylinder fins
cowl flaps
What should be avoided so that an engine is able to cool properly?
Select all that apply
running the engine on the ground for long periods with the throttle closed
climbing the aircraft at full power for a prolonged period of time at low airspeed
having cowl flaps open on approach to land
descending with the throttle closed for extended periods of time
Previous topic revision -
Thermal efficiency is...
fuel flow ÷ brake power
brake power ÷ indicated power
volume of charge ÷ piston displacement
fuel consumption ÷ indicated power
Previous topic revision -
What is the item shown in the picture?
camshaft
crankshaft
intake manifold
exhaust manifold
Previous topic revision -
Which is the correct statement?
diesel engines do not require a spark for ignition
the only advantage of having two spark plugs in an aero engine is for safety
BDC occurs when the piston is furthest away from the crankshaft
a disadvantage of fuel injection is the need for extra carburetor heat
Previous topic revision -
In respect of carburetor icing...
refrigeration icing and throttle icing both occur inside the carburetor
refrigeration icing occurs outside the carburetor and throttle icing inside
refrigeration icing occurs inside the carburetor and throttle icing occurs outside
refrigeration icing and throttle icing both occur outside the carburetor
