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Module 15 - Gas Turbine Engines > 15.7 - Exhuast > Flashcards

15.7 - Exhuast Flashcards

1
Q

What is the purpose of swirl vanes in a turbo-prop exhaust?

A

They create a suction effect, drawing air past the oil cooler. If swirl vanes are damaged or missing, they can cause excessive oil temperature on the ground

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2
Q

What shape is a subsonic exhaust nozzle?

A

Convergent

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3
Q

What is the maximum velocity across a convergent nozzle?

A

Mach 1.0

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4
Q

What are the two types of high bypass exhaust systems?

A

Internally mixed

Externally mixed

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5
Q

Where may you find a diverging exhaust nozzle?

A

Helicopter tailpipe to nullify thrust and improve hover capabilities

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6
Q

What is the purpose of the exhaust on the jet engine?

A

To convert gas potential energy into kinetic energy

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7
Q

In terms of pressure and velocity, what would you find at the exhaust nozzle exit?

A

High velocity, lower pressure

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8
Q

What is a choked nozzle?

A

Where the airflow velocity is at the speed of sound, at the smallest area of the nozzle

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9
Q

What engines extract the maximum amount of gas energy to be used by the turbine?

A

APUs and turbo shaft engines

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10
Q

In terms of pressure ratio, why are convergent/divergent nozzles used?

A

For higher pressure ratios than 2:1

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11
Q

Where will you find a CD nozzle?

A

On a supersonic jet

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12
Q

What is the most efficient nozzle shape for supersonic aircraft?

A

Iris nozzle

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13
Q

What are the three common types of thrust reverser?

A

Clam shell
Bucket door
Fan air reverser (blocker doors)

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14
Q

What are the two modes that a thrust reverser will operate in?

A

FADEC mode

Manual mode

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15
Q

What ATA chapter would you find reverse thrust in?

A

Chapter 78

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16
Q

What are blue deposits in the exhaust?

A

Titanium deposits

17
Q

What colour would aluminium deposits be in an engine exhaust?

A

Silver/White

18
Q

What is the main reason most exhaust systems have failures occur?

A

The high temperatures at which the exhaust system operates

19
Q

What is the purpose of the leaf springs in an APU exhaust?

A

They allow for thermal expansion

20
Q

How is reverse thrust limited to only ground use?

A

Weight-on-wheels switch preventing electrical selection of reverse thrust

21
Q

What are hot spots in the exhaust section a sign of?

A

Faulty combustion chamber or malfunctioning fuel nozzle

22
Q

What happens to supersonic air velocity as it travels through a divergent nozzle?

A

It increases in velocity

Module 15 - Gas Turbine Engines (22 decks)

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