M14 Day 1

In turbine clearance control what do you want the tip clearance to be?

• Exactly 1 inch
• As small as possible
• As large as possible
• Varies depending on the turbine model

At high speed what will your turbine tip clearance be?

• Low

• High

• Constant
• Unchanged

What air is normally used to cool the engine turbine casing?

• Cold fan air

• Pneumatic air

• Nitrogen gas
• Warm air from the exhaust section

On a jet engine what will accelerate airflow from the turbine as much as possible to create thrust?

• Gas turbine exhausts

• Reducing fuel flow
• Decreasing air intake

What purpose does the cone have on an exhaust?

• Guide discharge flow & prevent excessive turbulence

• Prevent discharge flow and increase turbulence

• Prevent reverse flow of exhaust gases to the hub of the turbine rear stage

• No purpose it just looks good

What do some engines have to increase propulsive efficiency?

• Exhaust gas mixer

• Exhaust gas separator

The exhaust gas must completely expand in a nozzle?

• True

• False

What must airflow in an exhaust nozzle guarantee?

• Radially orientated exhaust gas flow

• Axially orientated exhaust gas flow

• Laminar vortex-free gas flow

• Laminar vortex gas flow

Higher airflow in an aircraft engine exhaust will cause the airflow to become what?

• slower
• No effect

• Choked

• backwards

If an aircraft can fly at supersonic speeds what configuration of exhaust nozzle will they have?

• A-T

• C-D

• D-C

Answer explanation

They will have a Convergent-Divergent (C-D) exhaust to slow the gases back down