Jeppesen Chapter 6 - Exhaust Systems (22items)

Question 1

Q2. Name two types of reciprocating engine exhaust systems.

Answer 1

A2. The short stack and the collector system.

Question 2

Q3. What drawback in using collector-type exhaust systems is more than offset when used on turbocharged engines?

Answer 2

A3. The loss of horsepower due to exhaust system back pressure.

Question 3

Q4. What could result if the internal baffles or diffusers in an exhaust system fail?

Answer 3

A4. The flow of the exhaust gases could be restricted, resulting in a loss of engine power.

Question 4

Q5. What type of exhaust system is used on turbocharged engines?

Answer 4

A5. The collector system.

Question 5

Q6. What kind of material is normally used to make the muffler shrouds found in the exhaust system?

Answer 5

A6. Stainless steel.

Question 6

Q7. How do you inspect internal baffles and diffusers of an exhaust system?

Answer 6

A7. By disassembling the exhaust system and visually inspecting the components.

Question 7

Q8. Why is an exhaust system failure considered a severe hazard?

Answer 7

A8. It can result in carbon monoxide poisoning, loss of engine power, or fire.

Question 8

Q9. What could happen if lead, zinc, or galvanized marks are made on the exhaust system?

Answer 8

A9. They cause a change in molecular structure, which could result in cracks when heated.

Question 9

Q10. What happens if the heat exchanger leaks exhaust gasses into the induction system?

Answer 9

A10. There is a loss in engine power.

Question 10

Q11. What is an indication of an exhaust gas leak?

Answer 10

A11. A flat gray or sooty black deposit in the area of the leak.

Question 11

Q12. Where are the most common places to find cracks in an exhaust system?

Answer 11

A12. At welded or clamped areas and at the flanges.

Question 12

Q13. What is a common cause of turbocharger waste gate sticking?

Answer 12

A13. Coke deposits or carbon build-up.

Question 13

Q14. Why are turbocharged exhaust system leaks very damaging at high altitudes?

Answer 13

A14. Pressure differential will cause the leak to escape with torch-like intensity.

Question 14

Q15. What are exhaust system coke deposits?

Answer 14

A15. Excessive carbon build-up.

Question 15

Q16. What is the result of changing the exhaust nozzle area of a turbine engine?

Answer 15

A16. The engine’s performance and exhaust gas temperature change.

Question 16

Q17. Name the components of a typical turbine exhaust nozzle.

Answer 16

A17. The tail cone, exhaust ducts, and support struts

Question 17

Q18. What is the purpose of thrust reversers?

Answer 17

A18. They decelerate an aircraft after landing.

Question 18

Q19. How does a noise suppressor found on older turbojet engines work?

Answer 18

A19. It converts low frequency sound, which is audible over great distance, into high frequency sound, thus reducing the sound footprint

Question 19

Q20. What are the two most commonly used types of thrust reversers?

Answer 19

A20. The clamshell (mechanically blocked) and the cascade (or aerodynamically blocked.

Question 20

Q21. How much thrust do the thrust reversers produce compared to the engine’s full forward thrust?

Answer 20

A21. Substantially less

Question 21

Q22. What are the hazards of operating some thrust reversers at low ground speeds?

Answer 21

A22. Ingestion of foreign objects stirred up by the exhaust gasses and re-ingestion of hot exhaust gasses.

Question 22

Q1. What is the purpose of the exhaust system?

Answer 22

A1. To remove high temperature noxious gases.