Term
| What is the purpose of the exhaust system? |
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Definition
| To remove high temperature noxious gases |
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Term
| Name two types of reciprocating engine exhaust systems |
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Definition
| The short stack and the collector system |
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Term
| What drawback in using collector-type exhaust systems is more than offset when used on a turbocharged engine? |
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Definition
| The loss of horsepower due to exhaust system back pressure |
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Term
| What could result if the internal baffles or diffusers in an exhaust system fail? |
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Definition
| The flow of the exhaust gasses could be restricted, resulting in a loss of engine power |
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Term
| What type of exhaust system is used on turbocharged engines? |
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Definition
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Term
| What kind of material is normally used to make the muffler shrouds found in the exhaust system? |
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Definition
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Term
| How do you inspect the internal bafffles and diffusers of an exhaust system? |
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Definition
| By disassembling the exhaust system as necessary and visually inspecting the components |
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Term
| Why is an exhaust system failure considered a severe hazard? |
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Definition
| It can result in carbon monoxide poisoning, loss of engine power, or fire. |
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Term
| What could happen if lead, zinc, or galvenized marks are made on an exhaust system? |
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Definition
| They cause a change in the molecular structure, which could result in cracks when heated |
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Term
| What happens if the heat exchanger leaks exhaust gsases into the induction system? |
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Definition
| There is a loss of engine power |
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Term
| What is an indication of an exhaust gas leak? |
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Definition
| A flat gray or sooty black deposit in the area of the leak |
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Term
| What are the most common places to find cracks in an exhaust system? |
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Definition
| At welded or clamped areas and at the flanges |
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Term
| What is a common cause of turbocharger waste gate sticking? |
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Definition
| Coke deposits or carbon buildup |
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Term
| Why are turbocharged exhaust system leaks very damaging at high altitudes? |
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Definition
| Pressure differential will cause the leak to escape with a torch-like intensity |
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Term
| What are exhaust system coke deposits? |
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Definition
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Term
| What is the result of changing the exhaust nozzle are of a turbine engine? |
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Definition
| The engine's performance and exhaust gas temperature change. |
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Term
| Name the components of a typical turbine exhaust nozzle? |
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Definition
| The tail cone, exhaust ducts, and support struts |
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Term
| What is the purpose of thrust reversers? |
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Definition
| They help decelerate an aircraft after landing |
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Term
| How does a noise suppressor found on older turbojet engines work? |
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Definition
| It converts the low frequency sound, which is audible over a great distance, into high frequency sound, thus reducing the sound footprint |
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Term
| What are the two most commonly used types of thrust reversers? |
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Definition
| The clamshell (or mechanically blocked) and the cascade(or aerodynamically blocked |
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Term
| How much thrust do the thrust reversers produce compared to engine's full forward thrust? |
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Definition
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Term
| What are the hazards of operating some thrust reversers at low ground speeds? |
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Definition
| Ingestion of foreign objects stirred up by the exhaust gasses and re-ignition of the exhaust gasses. |
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