Exhaust Systems Flashcards
What is the purpose of the exhaust system?
To remove high temperature, noxious gases.
Name two types of reciprocating engine exhaust systems:
Short stack.
Collector system.
What drawback in using collector type exhaust systems is more than offset when used on turbo charged engines?
The loss of horsepower due to exhaust system back pressure.
What could result if the internal baffles or diffusers of an exhaust system fail?
The flow of exhaust gases could be restricted, resulting in a loss of engine power. 
What kind of material is normally used to make the muffler shrouds found in the exhaust system?
Stainless steel. 
What type of exhaust system is used on a turbo charged engine?
The collector system 
How do you inspect the internal baffles in diffusers of an exhaust system?
By disassembling the exhaust system as necessary, and visually inspecting the components.
Why is an exhaust system failure considered a severe hazard?
It can result in:
Carbon monoxide poisoning. Loss of engine power.
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 gases 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 deposita 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 wastegate sticking?
Coke deposits, or carbon buildup 
Why are turbo charged 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 performance and exhaust gas temperature change. 
Name the components of a typical turbine exhaust system:
Tail cone.
Exhaust ducts.
Support struts.
What is the purpose of thrust reversers?
They help decelerate an aircraft after landing.
How does a noise suppressor found on older turbo jet engines work?
It converts low frequency sound, which is audible over a great distance, into high frequency sound.
What are the two most commonly used types of thrust reversers?
The clam shell or mechanically blocked.
The cascade or aerodynamically blocked. 
How much thrust do thrust reversers produce compared to the engines full forward thrust? 
Substantially less.
What are the hazards of operating some thrust reversers at low ground speed?
Ingestion of foreign objects stirred up by the exhaust gases, and the re-ingestion of hot exhaust gases.
