Exhaust and Reverser Systems

Question 1

What is an indication of an exhaust gas leak?

Answer 1

A flat gray or sooty black deposit in the area of the leak

Question 2

What is the purpose of the exhaust system?

Answer 2

To remove high temperature noxious gases

Question 3

Name two types of reciprocating engine exhaust systems?

Answer 3

The short stack and the collector system

Question 4

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

Answer 4

The loss of horsepower due to exhaust system back pressure

Question 5

What could result if the internal baffles or diffusers in an exhaust system fails?

Answer 5

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

Question 6

What type of exhaust system is used on turbo charged engines?

Answer 6

The collector system

Question 7

Name the components of a typical turbine exhaust nozzle

Answer 7

Tail Cone, exhaust ducts, and support struts

Question 8

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

Answer 8

By disassembling and visually inspecting the components

Question 9

Why is an exhaust system Failure considered a severe hazard?

Answer 9

It can result in carbon monoxide poisoning and loss of engine and fire

Question 10

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

Answer 10

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

Question 11

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

Answer 11

Stainless steel

Question 12

What is a common cause of turbo charger wastegate sticking?

Answer 12

Coke deposits or carbon buildup

Question 13

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

Answer 13

There is a loss of engine power

Question 14

What are exhaust system coke deposits?

Answer 14

Excessive carbon buildup

Question 15

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

Answer 15

At welded or clamped areas in at the flanges

Question 16

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

Answer 16

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

Question 17

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

Answer 17

The engines performance and exhaust gas temperature change

Question 18

What is the purpose of thrust reversers?

Answer 18

They help decelerate an aircraft after landing

Question 19

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

Answer 19

It converts low frequency sound into high frequency sound thus reducing the sound footprint

Question 20

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

Answer 20

The clamshell, which is mechanically blocked and the cascade, which is aerodynamically blocked

Question 21

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

Answer 21

Substantially less

Question 22

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

Answer 22

Ingestion of foreign objects

Question 23

What is the primary function of an exhaust system in regards to safety?

Answer 23

To provide protection against the potential destructive action of exhaust gases

Question 24

What is the function of the thermocouple probes in a turbine exhaust Cal pipe?

Answer 24

To measure EGT