Induction and Engine Airflow Systems Flashcards
A method commonly used to prevent carburetor icing is to what?
preheat the intake air.
Carburetor icing is most severe at what?
air temperatures between 30 and 40 degrees F
Into what part of a reciprocating engine induction system is deicing alcohol normally injected?
The airstream ahead of the carburetor.
Carburetor icing on an engine equipped with a constant-speed propeller can be detected by what?
a decrease in manifold pressure with a constant RPM.
What part of an aircraft in flight will begin to accumulate ice before any other?
Carburetor
Carburetor icing may be eliminated by which of the following methods?
Alcohol spray and heated induction air.
Where would a carburetor air heater be located in a fuel injection system?
None is required.
An increase in manifold pressure when carburetor heat is applied indicates what?
ice was forming in the carburetor.
During full power output of an unsupercharged engine equipped with a float-type carburetor, in which of the following areas will the highest pressure exist?
Carburetor air scoop.
The use of the carburetor air heater when it is not needed causes what?
a decrease in power and possibly detonation.
As manifold pressure increases in a reciprocating engine, the…
density of the air in the cylinder increases.
Which of the following statements regarding volumetric efficiency of an engine is true?
It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type.
Bootstrapping of a turbocharged engine is indicated by what?
A transient increase in engine power.
Which of the following would be a factor in the failure of an engine to develop full power at takeoff?
Improper adjustment of carburetor heat valve control linkage.
If the turbocharger waste gate is completely closed, …
all the exhaust gases are directed through the turbine.
Boost manifold pressure is generally considered to be any manifold pressure above what?
30 “Hg
What is the purpose of the density controller in a turbocharger system?
Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle.
What is the purpose of the rate-of-charge controller in a turbocharger system?
Controls the rate at which the turbocharger discharge pressure will increase.
What directly regulates the speed of a turbocharger?
Waste gate.
What is the purpose of a turbocharger system for a small reciprocating aircraft engine?
Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine.
What are the three basic regulating components of a sea-level boosted turbocharger system?
Exhaust bypass assembly, density controller, and differential pressure controller.
The differential pressure controller in a turbocharger system…
reduces bootstrapping during part-throttle operation.
The pressure between the turbocharger and the throttle valve is called what?
upper deck pressure.
Which of the following is a function of the differential pressure controller?
It controls all positions of the waste gate except at fully open position.
The purpose of a sonic venturi on a turbocharged engine is to what?
limit the amount of air that can flow from the turbocharger into the cabin for pressurization.
What is used to drive a supercharger?
Gear train from the crankshaft.
The purpose of a bellmouth compressor inlet is to what?
maximize the aerodynamic efficiency of the inlet.
What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators installed?
Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens.
The vortex dissipators installed on some turbine powered aircraft to prevent engine FOD utilize what?
a stream of engine bleed air blown toward the ground ahead of the engine.
Vortex dissipator systems are generally activated by what?
a landing gear switch.
When an engine with a subsonic divergent type inlet duct is running in place at high speed on the ground, the air pressure within the inlet is what?
positive.
What engine instrument indications shift when a turbofan engine anti-icing (bleed air) system is turned on?
tachometer, EGT, and EPR
The purpose of an engine/inlet anti-ice system is primarily to what?
prevent ice formation in engine and/or inlet areas.
If carburetor or induction system icing is not present when carburetor heat is applied with no change in the throttle setting, the what?
mixture will become richer.
When starting an engine equipped with a carburetor air heater, in what position should the heater be placed?
COLD.
The application of carburetor heat during engine operation will what?
decrease the weight of the fuel/air charge.
The application of carburetor heat will have which of the following effects?
The mixture will become richer.
When operating an engine, the application of carburetor heat will have what effect on the fuel/air mixture?
Enriching the mixture until the AMC can make a compensation.
In addition to causing accelerated wear, dust or sand ingested by a reciprocating engine may also cause what?
silicon fouling of spark plugs.
In an airplane equipped with an alternate air system, if the main air duct air filter becomes blocked or clogged, the…
system will automatically allow warm, unfiltered air to be drawn into the engine.
If a fire starts in the induction system during the engine starting procedure, what should the operator do?
Continue cranking the engine.
On a small aircraft engines, fuel vaporization may be increased by what?
circulating the fuel and air mixture through passages in the oil sump.
The action of a carburetor air scoop is to supply air to the carburetor, but it may also what?
increase the pressure of the incoming air by ram effect.
A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the what?
loses of power and possible detonation.
