15.07

Question 1

What does the exhaust system do?

Answer 1

Guides the exhaust gases

Question 2

What does the exhaust do to airflow?

Answer 2

Accelerates it

Question 3

What does the cone in the exhaust prevent?

Answer 3

Reverse flow

Question 4

Where does the cold and hot air go in the exhaust?

Answer 4

Hot air to the primary nozzle and cold air to the secondary nozzle

Question 5

What does mixing do and improve in the exhaust?

Answer 5

Improves mixing of hot and cold air to get higher propulsion efficiency

Question 6

How do you achieve optimum thrust?

Answer 6

Gas must expand fully in the exhaust nozzle

Question 7

What is the exhaust airflow caused by?

Answer 7

Pressure ratio between turbine discharge and ambient pressure

Question 8

What ratio do convergent exhausts reach?

Answer 8

2:1

Question 9

What does EPNdB stand for?

Answer 9

Effective perceived noise decibel

Question 10

What are the two methods used to reduce noise levels of an engine?

Answer 10

Deigns and dampening internal and external noises

Question 11

What do acoustic linings do?

Answer 11

Increase the weight but dampen noise a lot

Question 12

On a wet, icy or snow covered runway what is reduced?

Answer 12

Braking

Question 13

What are thrust reversers and what angle do they deploy at?

Answer 13

Reverse the flow of air and deploy at 45/60 degrees

Question 14

Where are clamshell door type reversers used?

Answer 14

Older jet aircraft with a low bypass ratio

Question 15

What type of thrust reverse door is used on modern aircraft?

Answer 15

Pivot door

Question 16

What speed is thrust reverse most efficient at?

Answer 16

High speed

Question 17

What does the reversed airflow have to be matched to?

Answer 17

The engine position

Question 18

Why is thrust reverse design more important on 4 engine aircraft?

Answer 18

The reversed air can be ingested by the other engine

Question 19

How is the flow out of the reverse thrusters altered?

Answer 19

Using the cascade vanes in the cowlings

Question 20

What’s the control system used for?

Answer 20

To activate reverse thrust and change engine power

Question 21

What is the reverser actuation system?

Answer 21

Moves airflow deflection mechanisms from signals from reverse control system

Question 22

What do the airflow deflection devices do?

Answer 22

Change the direction of the air

Question 23

What does the thrust reverse interlock ensure?

Answer 23

Engine power can only increase when reversers are fully deployed

Question 24

Pneumatic reverser actuation systems are only used on what type of thrust reverser?

Answer 24

Cascade

Question 25

What does reverse unlock message indicate?

Answer 25

Reverser is stowed but not safe

Question 26

What does a green reverse light indicate?

Answer 26

Reverser is fully deployed and interlock is released