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Power-Plant
ENGINE EXHAUST SYSTEMS
| Question | Answer |
|---|---|
| Of what material are most reciprocating engine exhaust components made? | Corrosion-resistant steel. |
| How is the speed of a turbocharger controlled? | 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. |
| What type of actuator is used to control the position of the turbocharger waste gate? | A hydraulic actuator that uses engine oil pressure to move the piston. |
| How does a power recovery turbine increase the power of a reciprocating engine? | 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. |
| How tight should the clamps be tightened that hold sections of a reciprocating engine exhaust system together? | They should not be so tight that they will be damaged when heat expands the exhaust system components. |
| What would be the effect on engine performance of an internal failure of a muffler? | This will increase the exhaust back pressure and cause a loss of engine power. |
| What effect on turbine engine operation is caused by a change in the area of the exhaust nozzle? | Altering the area of the exhaust nozzle affects the compression ratio, the RPM, the mass airflow through the engine, and the EGT. |
| What are two types of thrust reversers that are used with turbojet engines? | Mechanical blockage (clamshell) and aerodynamic blockage (cascade). |
| How does a noise suppressor reduce the amount of noise produced by a turbojet engine? | 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. |
| What is the purpose of the ball joints and bellows in the exhaust system of a reciprocating engine? | The ball joints and bellows allow the exhaust system components to change their dimensions without causing any leaks. |
| Why do some supersonic aircraft use a convergent-divergent exhaust duct? | A CD exhaust duct controls the gas expansion as it leaves the engine so the gases will produce thrust at supersonic velocities. |
| Why is it important that a lead pencil never be used to mark on an aircraft exhaust system? | The graphite in a lead pencil will infuse into the metal when it gets hot. It makes the metal brittle and likely to crack. |
| What type of damage is normally found in the hot section of a turbine engine? | Cracks caused by heat. |
Created by:
Aima2019
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