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23 Cards in this Set
- Front
- Back
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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 some part of the exhaust system.
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Where does the alternate air come from that is used with a pressure carburetor or a fuel injection system?
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From inside the engine cowling.
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Where does carburetor ice normally form in a carburetor?
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In the throat of the carburetor, on and around the throttle valve.
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Does the application of carburetor heat cause the fuel–air mixture to become richer or to become leaner?
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Heated air causes the fuel–air mixture to become richer.
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What is used to drive most of the external superchargers used on modern reciprocating engines?
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Exhaust gases.
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What controls the speed of a turbocharger compressor?
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The amount of exhaust gas that is forced to flow through the turbine. This is controlled by the position of the waste gate.
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What is meant by a convergent inlet duct for a turbine engine?
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A convergent duct is one whose cross–sectional area becomes smaller in the direction the air flows.
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What is meant by a divergent inlet duct for a turbine engine?
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A divergent duct is one whose cross–sectional area becomes greater in the direction the air flows.
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What kind of inlet duct is often used on turbine–powered helicopters?
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A bell–mouthed inlet duct.
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What is the danger of operating an aircraft reciprocating engine with too high a carburetor air temperature?
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Too high a carburetor air inlet temperature can cause the fuel–air mixture to reach its critical temperature and detonate.
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Why do some turbine engines use variable inlet guide vanes?
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These variable inlet guide vanes are automatically adjusted to direct the air into the engine in such a way that it keeps the RPM vs. velocity proper for the most efficient operation.
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How do some turbine engines prevent ice formation on the inlet guide vanes?
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Hot compressor bleed air flows through hollow inlet guide vanes.
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What is usually installed in a large reciprocating engine between the turbosupercharger and the carburetor?
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An intercooler. This is an air–to–air heat exchanger.
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In what position should the carburetor heat control be placed when starting a reciprocating engine?
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In the Cold position.
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How does an engine air inlet vortex destroyer help prevent foreign object damage to the engine?
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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.
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Why does ice form in the throat of a float carb?
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When liquid fuel evaporates it absorbs enough heat from the air to cause moisture to condense out and freeze
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What happens to engine RPM when carb heat is applied?
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RPM drops
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Why should the use of carb heat be limited when operating an engine with the aircraft on the ground?
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Air that flows into the engine when carb heat is applied is not filtered
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Why is a fuel–injected recip not as prone to icing as an engine with a float carb?
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In a fuel–injected engine the liquid fuel evaporates in the intake valve chamber of the hot cylinder head
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How is ice prevented from forming on the nose cowl, nose dome and inlet guide vanes of a turbine engine?
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Hot compressor bleed air flows through passages in these components to keep them too warm for ice to form
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What does a fuel–injected engine have that prevents the loss of induction air, if the air inlet filter should become covered with ice?
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Alternate air valve allows warm air from inside the engine cowling to flow into the fuel metering system
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What would be the effect on engine operation of an air leak in the intake pipe for one cylinder?
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That cylinder would run lean and detonation could occur
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Why is it very important that the induction air filters be kept clean and replaced as often as the manufacturer recommends?
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Clogged air filters can restrict the air entering the engine |
