Exhaust Systems Flashcards

1
Q

What is the purpose of the exhaust system?

A

To remove high temperature, noxious gases.

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2
Q

Name two types of reciprocating engine exhaust systems:

A

Short stack.
Collector system.

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3
Q

What drawback in using collector type exhaust systems is more than offset when used on turbo charged engines?

A

The loss of horsepower due to exhaust system back pressure.

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4
Q

What could result if the internal baffles or diffusers of an exhaust system fail?

A

The flow of exhaust gases could be restricted, resulting in a loss of engine power. 

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5
Q

What kind of material is normally used to make the muffler shrouds found in the exhaust system?

A

Stainless steel. 

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6
Q

What type of exhaust system is used on a turbo charged engine?

A

The collector system 

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7
Q

How do you inspect the internal baffles in diffusers of an exhaust system?

A

By disassembling the exhaust system as necessary, and visually inspecting the components.

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8
Q

Why is an exhaust system failure considered a severe hazard?

A

It can result in:
Carbon monoxide poisoning. Loss of engine power.
Fire.

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9
Q

What could happen if lead, zinc, or galvanized marks are made on an exhaust system?

A

They cause a change in molecular structure, which could result in cracks when heated. 

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10
Q

What happens if the heat exchanger leaks exhaust gases into the induction system?

A

There is a loss of engine power. 

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11
Q

What is an indication of an exhaust gas leak?

A

A flat gray or sooty black deposita in the area of the leak.

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12
Q

Where are the most common places to find cracks in an exhaust system?

A

At welded or clamped areas and at the flanges.

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13
Q

What is a common cause of Turbocharger wastegate sticking?

A

Coke deposits, or carbon buildup 

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14
Q

Why are turbo charged exhaust system leaks very damaging at high altitudes? 

A

Pressure differential will cause the leak to escape with torch like intensity 

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15
Q

What are exhaust system coke deposits? 

A

Excessive carbon buildup 

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16
Q

What is the result of changing the exhaust nozzle area of a turbine engine?

A

The engine performance and exhaust gas temperature change. 

17
Q

Name the components of a typical turbine exhaust system:

A

Tail cone.
Exhaust ducts.
Support struts.

18
Q

What is the purpose of thrust reversers?

A

They help decelerate an aircraft after landing.

19
Q

How does a noise suppressor found on older turbo jet engines work?

A

It converts low frequency sound, which is audible over a great distance, into high frequency sound.

20
Q

What are the two most commonly used types of thrust reversers?

A

The clam shell or mechanically blocked.
The cascade or aerodynamically blocked. 

21
Q

How much thrust do thrust reversers produce compared to the engines full forward thrust? 

A

Substantially less.

22
Q

What are the hazards of operating some thrust reversers at low ground speed?

A

Ingestion of foreign objects stirred up by the exhaust gases, and the re-ingestion of hot exhaust gases.