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M. engine exhaust
engine exhaust systems 13
| Question | Answer |
|---|---|
| what is the purpose of the exhaust system? | to remove high temperature noxious gases. |
| name two types of reciprocating engine exhaust systems. | the short stack and the collector system. |
| what drawback in using collector-type exhaust systems is more than offset when used on turbocharged engine? | the loss of horsepower due to exhaust system back pressure. |
| what could result if the internal baffles of diffusers in an exhaust system fail? | the flow of the exhaust gases could be restricted, resulting in a loss of engine power. |
| what type of exhaust system is used on turbocharged engines? | the collector system. |
| what kind of material is normally used to make the muffler shrouds found in the exhaust system? | stainless steel. |
| how do you inspect the internal baffles and diffusers of an exhaust system? | by disassembling the exhaust system as necessary and visually inspecting the components. |
| why is an exhaust system failure considered an extreme hazard? | it can result in carbon monoxide poisoning, loss of engine power, or fire. |
| what could happen if lead, zinc, or galvanized marks are made on an exhaust system? | they cause a change in molecular structure, which could result in cracks when heated. |
| what happens if the heat exchanger leaks exhaust gasses into the induction system? | there is a loss of engine power. |
| what is an indication of an exhaust gas leak? | a flat gray or sooty black deposit in the area of the leak. |
| where are the most common places to find cracks in an exhaust system? | at welded or clamped areas and at the flanges. |
| what is a common cause of turbocharger waste gate sticking? | coke deposits or carbon buildup. |
| why are turbocharged exhaust system leaks very damaging at high altitudes? | pressure differential will cause the leak to escape with torch-like intensity. |
| what are exhaust system coke deposits? | excessive carbon buildup. |
| what is the result of changing the exhaust nozzle area of a turbine engine? | the engine's performance and exhaust gas temperature change. |
| name the components of a typical turbine exhaust nozzle.(3) | the tail cone, exhaust ducts, and support struts. |
| what is the purpose of the thrust reversers? | they help decelerate an aircraft after landing. |
| how does a noise suppressor found on older turbojet engines work? | it coverts low frequency sound, which is audible over great distance, into high frequency sound, thus reducing the sound footprint. |
| what are the two most commonly used types of thrust reversers? | the clamshell (or mechanically blocked) and the cascade (or aerodynamically blocked). |
| how much thrust do the thrust reversers produce compare to the engine's full forward thrust? | substantially less. |
| what are the hazards of operating some thrust reversers at low ground speeds? | ingestion of foreign objects stirred up by the exhaust gasses and re-ingestion of hot exhaust gasses. |
Created by:
Justin84
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