Induction and Engine Airflow Systems Flashcards
Why does ice form in the throat of a float carburetor?
When liquid fuel evaporates it absorbs enough heat from the air to cause moisture to condense out and freeze.
Does the application of carburetor heat cause the fuel-air mixture to become richer or leaner?
The less dense, heated air draws the same amount of fuel from the carburetor as cold air, therefore the mixture becomes richer.
What happens to engine RPM when carburetor heat is applied?
The RPM drops.
Why should the use of carburetor heat be limited when operating an engine with the aircraft on the ground?
The air that flows into the engine when carburetor heat is applied is not filtered.
Why is a fuel-injected reciprocating engine not as prone to icing as an engine equipped with a float carburetor?
In a fuel-injected engine, the liquid fuel evaporates in the intake valve chamber of the hot cylinder head.
How is ice prevented from forming on the nose cowl, nose dome and inlet guide vanes of a turbine engine?
Hot compressor bleed air flows through passages in these components to keep them too warm for ice to form.
What does a fuel-injected engine have that prevents the loss of induction air, if the air inlet filter should become covered with ice?
An alternate air valve allows warm air from inside the engine cowling to flow into the fuel metering system.
What would be the effect on engine operation of an air leak in the intake pipe for one cylinder?
That cylinder would run lean and detonation could occur.
Why is it very important that the induction air filters be kept clean and replaced as often as the manufacturer recommends?
Clogged air filters can restrict the air entering the engine.
