Engine Exhaust and Reverser Systems Flashcards

1
Q

Of what material are most reciprocating engine exhaust components made?

A

Corrosion-resistant steel.

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2
Q

How is the speed of a turbocharger controlled?

A

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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3
Q

What type of actuator is used to control the position of the turbocharger waste gate?

A

A hydraulic actuator that uses engine oil pressure to move the piston.

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4
Q

How does a power recovery turbine increase the power of a reciprocating engine?

A

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 crank-shaft.

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5
Q

How tight should the clamps be tightened that hold sections of a reciprocating engine exhaust system together?

A

They should not be so tight that they will be damaged when heat expands the exhaust system components.

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6
Q

What would be the effect on engine performance of an internal failure of a muffler?

A

This will increase the exhaust back pressure and cause a loss of engine power.

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7
Q

What effect on turbine engine operation is caused by a change in the area of the exhaust nozzle?

A

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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8
Q

What are two types of thrust reversers that are used with turbojet engines?

A

Mechanical blockage (clamshell) and aerodynamic blockage (cascade).

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9
Q

How does a noise suppressor reduce the amount of noise produced by a turbojet engine?

A

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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10
Q

What is the purpose of the ball joints and bellows in the exhaust system of a reciprocating engine?

A

The ball joints and bellows allow the exhaust system components to change their dimensions without causing any leaks.

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11
Q

Why do some supersonic aircraft use a convergent-divergent exhaust duct?

A

A convergent-divergent exhaust duct controls the gas expansion as it leaves the engine so the gasses will produce thrust at supersonic velocities.

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12
Q

Why is it important that a lead pencil never be used to mark an aircraft exhaust system?

A

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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13
Q

What type of damage is normally found in the hot section of a turbine engine?

A

Cracks caused by heat.

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