Jeppesen Oral- Chapter 5 (Induction Systems) Flashcards
air scoop, carburetor or fuel control, intake manifold
Engine will not produce its rated power or not run at all.
Reduces power
impact ice, fuel evaporation ice, throttle ice
Lower rpm, throttle is mostly closed which offers greater surface area for ice to accumulate
Engine runs rough at lower r.p.m.
Noticeable power loss
Detonation
Internally and externally dirven
How and what point does an internally driven supercharger boost air pressure?
Impeller compresses the fuel/air mixture after it leaves the carbuetor
Will not be able to develop rated H.P. at certain altitudes and may not be able to reach critical altitude
Controls the amount of exhaust gas directed over the turbine
Waste-gate controller malfunction
Mechanically with linkages Hydraulically with engine oil
sonic venturi
Causes air velocity to decrease which increases pressure and aids in compression
It accelerates the flow of incoming air and debris through a curved intake. The debris gains TOO much inertia to allow it to follow the curved intake towards the engine and thus is channeled away from the compressor
Engine bleed air and electric heating elements
Where does the alternative air come from that is used with a pressure carburetor or a fuel injection system?
From inside the engine cowling.
Where does carburetor ice normally form in a carburetor?
In the throat of the carburetor, on and around the throttle valve.
Does the application of carburetor heat cause the fuel-air mixture to become richer or leaner?
Heated air causes the fuel-air mixture to become richer.
What is meant by a convergent inlet duct for a turbine engine?
A convergent duct is one whose cross-sectional area becomes smaller in the direction air flows.
What is meant by a divergent inlet duct for a turbine engine?
A divergent duct is one whose cross-sectional area becomes greater in the direction the air flows.
What kind of inlet is often used on turbine-powered helicopters?
A bell-mouthed inlet duct
What is the dander of operating an aircraft reciprocating engine with too high a carburetor air temperature?
Too high a carburetor air inlet temperature can cause the fuel-air mixture to reach its critical temperature and detonate.
Why do some turbine engines use variable inlet guide vanes?
These variable inlet guide vanes are automatically adjusted to direct he air into the engine in such a way the it keeps the RPMs vs. velocity proper for the most efficient operation.
How do some turbine engines prevent ice formation on the inlet guide vanes?
Hot compressor bleed air flows through hollow inlet guide vanes.
What is usually installed in a large reciprocating engine between the turbosupercharger and the carburetor?
An intercooler. This is an air-to-air heat exchanger.
In what position should the carburetor heat control be placed when starting a reciprocating engine?
In the COLD position
How does an engine air inlet vortex destroyer help prevent foreign object damage to the engine?
A high-velocity stream of compressor bleed air is blown out in front of the engine to break up the vortices that form in front of the engine when it is operating at high power on the ground.
