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21 Cards in this Set

  • Front
  • Back

Where is the heat taken from that is used to heat the induction air in a reciprocating engine?

From a muff that is installed around a part of the exhaust system.

Where does the alternate 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 and throttle valve of the carburetor

What is used to drive most of the external superchargers used on modern reciprocating engines?
Exhaust gases.
What controls the speed of a turbocharger compressor?

The amount of exhaust gas that is forced to flow through the turbine in the turbo housing

What is meant by a convergent inlet duct for a turbine engine?

An inlet whose cross–sectional area becomes smaller in the direction the air flows.

What is meant by a divergent inlet duct for a turbine engine?

An inlet whose cross–sectional area becomes greater in the direction the air flows.

What kind of inlet duct is often used on turbine–powered helicopters?

A bell mouth inlet duct.

What is the danger of operating an aircraft reciprocating engine with too high a carburetor air temperature?

Can cause detonation.

Why do some turbine engines use variable inlet guide vanes?

Converts velocity energy into pressure energy and directs the flow of air

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

How does an engine air inlet vortex destroyer help prevent foreign object damage to the engine?

A high–velocity stream of compressed bleed air is blown out in front of the engine, to break up the air vortex created in front of the engine when it is operating at high power on the ground.

Why does ice form in the throat of a float carb?

When the fuel evaporates it absorbs enough heat from the air to cause condensation, then freezes.

What happens to engine RPM when carb heat is applied?
RPM drops
Why should the use of carb heat be limited when operating an engine with the aircraft on the ground?

carb heat is applied is not filtered

Why is a fuel–injected recip not as prone to icing as an engine with a float carb?

because the 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?

compressed 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?

Alternate air valves allow warm air from inside the engine cowling

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 resulting in power loss