Mixture, Aeroplane: Propellers, Performance & Engine Handling Flashcards
For a piston engine, the chemically correct fuel/air ratio is?
1:15
In a 4-stroke normal aspirated piston engine at altitude, which of the following causes the air-fuel mixture to enter the cylinders?
The difference between ambient pressure and pressure inside the cylinder
In a piston engine, turbocharger boost pressure can be monitored by?
A manifold pressure gauge only.
Fixed-pitch propellers are usually designed for maximum efficiency at?
Cruising speed.
The main advantage of a constant speed propeller compared to a fixed pitch propeller is that a constant speed propeller?
Maintains its maximum propeller efficiency over a wider range of airspeeds.
How can FADEC systems on piston engines usually achieve a level of redundancy?
Each engine is fitted with two FADEC computers.
What should the air/fuel ratio be during a take-off at sea level in a piston engine?
10:1
For piston engines, mixture ratio is the ratio between the?
mass of fuel and mass of air entering the cylinder.
What is a normally aspirated engine?
An engine without a supercharger or turbocharger
The maximum horsepower output which can be obtained from an engine when it is operated at specified RPM and manifold pressure conditions established as safe for continuous operation is named?
Rated Power.
An EGT (Exhaust Gas Temperature) indicator for a piston engine is used to?
Assist the pilot to set the correct mixture.
After start of a piston engine, correct operation of the pitch adjustment system of a constant speed propeller can be confirmed by altering the propeller control lever and checking indications on the?
Tachometer.
When an engine is stopped in flight and the propeller blade angle is near 90°, The propeller is said to be?
Feathered
On an aeroplane with a piston engine and a fixed pitch propeller the power output is monitored on the?
RPM Indicator.
What moves the propeller blade towards fine pitch?
Centrifugal force.
In a piston engine if the ratio of air to fuel is approximately 9:1 the mixture is?
Rich.
The kind of compressor normally used in a piston engine as a turbocharger is?
A centrifugal compressor.
Assuming the RPM and throttle levers are not altered, when TAS increases the blade angle of a constant speed propeller will?
Increase
The “slipstream effect” of a propeller is most prominent at?
Low airspeeds with high power setting.
How will high humidity effect Turbine and Piston engines?
They will both have decreased performance
An intercooler fitted between a supercharger and the inlet manifold will?
Minimise the risk of detonation.
If the manifold pressure is increased, the blade angle of a constant speed propeller will?
Increase
The blade angle of a propeller is the angle between the?
Reference chord line and the propeller plane of rotation.
A turbocharger system in a reciprocating engine is normally driven by?
The exhaust system.
The mechanism to change the propeller blade angle of a small piston engine aeroplane in flight is operated hydraulically by?
Engine oil
