Q05 Gas Turbines Exhausts

Question 1

The exhaust system is responsible for some or all of the Jet Thrust in a Gas Turbine system, depending on the design of the engine. What other thrust comes from the Exhaust?

Select one:

a.Static

b.Pressure

c.Dynamic

d.There is no further thrust generated.

Answer 1

b.Pressure

Question 2

Is it true or false that the exhaust system if designed poorly can affect the amount of stall in the compressor?

Select one:

False
True

Answer 2

True

Question 3

The propelling nozzle is designed to:

Select one:

a.To decrease the velocity and the pressure of the gas stream

b.To increase the velocity and the pressure of the gas stream

c.Increase the velocity and decrease the pressure of the gas stream

d.Decrease the velocity and increase the pressure of the gas stream

Answer 3

c.Increase the velocity and decrease the pressure of the gas stream

Question 4

The tail cone on the back of the Turbine Disc is designed to:

Select one:

a.Is another name for the propelling nozzle

b.Ensures that hot gases are trapped behind the disc.

c.slows gases to minimise friction losses

d.Together with the tail pipe, forms a convergent duct to accelerate the gases and maximise thrust.

Answer 4

c.slows gases to minimise friction losses

Question 5

High Bypass Turbofan reversers are normally [ ] operated. They reverse [ ] of the engine.

Answer 5

[Hydraulically] [only the cold thrust]

Question 6

Bucket Reversers are [ ] operated. They reverse [ ] of the engine.

Answer 6

[Hydraulically] [All the thrust]

Question 7

Clamshell Reversers are [ ] operated. They reverse [ ] of the engine.

Answer 7

[Pneumatically] [All the thrust]

Question 8

In flight one of the N1 indicators shows REV in the colour Amber, what does this mean?

a.The reverser doors are unlocked.

b.The engine is ready for you to select reverse.

c.This is normal as it regularly self tests in flight.

d.The reverser doors are locked and the system is in at least Reverse Idle.

Answer 8

a.The reverser doors are unlocked.