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13 Cards in this Set
- Front
- Back
Of what material are most reciprocating engine exhaust components made?
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Corrosion-resistant steel.
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How is the speed of a turbocharger controlled?
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By controlling the amount of exhaust gas that flows through the turbine. This is controlled by the position of the waste gate that is in the exhaust pipe.
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What type of actuator is used to control the position of the turbocharger waste gate?
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A hydraulic actuator that uses engine oil pressure to move the piston.
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How does a power recovery turbine increase the power of a reciprocating engine?
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Exhaust-driven velocity turbines are coupled through a hydraulic drive to the engine crankshaft. Energy that would normally be lost is used to drive the turbines, and the turbines assist in turning the crankshaft.
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How tight should the clamps be tightened that hold sections of a reciprocating engine exhaust system together?
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They should not be so tight that they will be damaged when heat expands the exhaust system components.
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What would be the effect on engine performance of an internal failure of a muffler?
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This will increase the exhaust back pressure and cause a loss of engine power.
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What effect on turbine engine operation is caused by a change in the area of the exhaust nozzle?
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Altering the area of the exhaust nozzle affects the compression ratio, the RPM, the mass airflow through the engine, and the EGT
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What are two types of thrust reversers that are used with turbojet engines?
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Mechanical blockage (clamshell) and aerodynamic blockage (cascade).
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How does a noise suppressor reduce the amount of noise produced by a turbojet engine?
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It breaks up the low-frequency vibrations in the exhaust stream and converts them into higher frequencies. These high frequencies are dissipated by the air more easily than low frequencies.
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What is the purpose of the ball joints and bellows in the exhaust system of a reciprocating engine?
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The ball joints and bellows allow the exhaust system components to change their dimensions without causing any leaks.
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Why do some supersonic aircraft use a convergent-divergent exhaust duct?
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A CD exhaust duct controls the gas expansion as it leaves the engine so the gases will produce thrust at supersonic velocities.
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Why is it important that a lead pencil never be used to mark on an aircraft exhaust system?
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The graphite in a lead pencil will infuse into the metal when it gets hot. It makes the metal brittle and likely to crack.
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What type of damage is normally found in the hot section of a turbine engine?
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Cracks caused by heat.
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