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Powerplant > Turbine Design > Flashcards

Turbine Design Flashcards

1
Q

What is it called when combustion occurs at a constant pressure?

A

Brayton Cycle

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2
Q

What happens when you have a hung start on a turbine engine?

A

Compressor fails to reach idle RPM
Shut it down

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3
Q

In the hot section of a jet engine, it is susceptible to what type of damage?

A

Cracking

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4
Q

The turbine jet nozzle is located in what section?

A

Exhaust

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5
Q

What is used to do internal inspections on a turbine engine?

A

Borescope

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6
Q

In the turbine section, what is the most common type of blade attachment?

A

Fir tree

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7
Q

What type of compressor has the greatest rise in pressure per stage?

A

Centrifugal flow compressors

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8
Q

When supersonic air flows through a divergent nozzle, what happens to pressure and velocity?

A

Pressure decreases
Velocity increases

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9
Q

The compression ratio of an axial compressor is the function of..?

A

Number of compression stages

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10
Q

Time Before Overhaul (TBO) is established by..?

A

The manufacturer

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11
Q

The primary advantage of axial compressor over centrifugal is?

A

High peak efficiency of airflow
Smaller in size and weight

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12
Q

At what stage on a turbine engine is the air pressure the greatest?

A

Diffuser

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13
Q

What is standard sea level pressure?

A

29.92 Hg

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14
Q

In a dual axial compressor, the first stage turbine drives the…?

A

N2 high pressure compressor and accessories

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15
Q

Anti-ice in air inlet is usually accomplished through the use of…?

A

Bleed air

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16
Q

The process for removing dirt from compressor blades is called…?

A

Field cleaning

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17
Q

Where is the highest heat to metal contact?

A

Turbine Inlet Guide Vanes

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18
Q

Heat and centrifugal force on a turbine blade is likely to cause..?

A

Growth, Stretching, Creep

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19
Q

What type of turbine engine produces all of its thrust by imparting a high exit velocity to the exhaust gases as it leaves the exhaust duct?

A

Turbojet

20
Q

What compressor uses an impeller to compress the incoming air?

A

Centrifugal

21
Q

If the RPM of an axial flow compressor remains constant, the angle of attack of the rotor blades are changed by…?

A

Inlet velocity changes

22
Q

The EPR readings are taken from what two stations of a jet engine?

A

Front compressor (intake)
Rear of turbine (exhaust)

23
Q

What is the proper sequence to starting a turbine engine?

A

Starter, Ignition, Fuel

24
Q

What effects does the exhaust cone have on pressure and velocity? Is it convergent or divergent?

A

Divergent
Velocity decreases
Pressure increases

25
Q

For a turbofan engine, the turbofan ratio speed is the same as what?

A

N1 low pressure compressor

26
Q

When the variable bleed valves are in the open position, the variable inlet guide vanes are in what position?

A

Closed

27
Q

Where is the diffuser located?

A

After compressor, before turbine

28
Q

Fan blade shingling is caused by..?

A

FOD & Overspeed

29
Q

What is the function of the inlet guide vanes?

A

Direct air at the proper angle

30
Q

What is the major function of the high pressure N2 turbine section?

A

Drives the compressor

31
Q

What is a shrouded turbine?

A

It prevents air from flowing over the blade tips

32
Q

What is Newton’s third law?

A

Every action has an equal and opposite reaction

33
Q

What does subsonic air do through a convergent duct?

A

Increase velocity
Decrease pressure

34
Q

What instrument shows the first indication of a good start?

A

EGT

35
Q

How do you re-install turbine/fan blades?

A

The same slot removed from

36
Q

If you remove a fan blade and replace it with one of a different weight, what must you also do?

A

Must replace the blade at 180 degrees as well

37
Q

In a dual axial compressor, what drives the gear box?

A

N2 High pressure

38
Q

How does the stator vane assembly affect the velocity of air in an axial flow compressor?

A

Converts pressure

39
Q

In a dual spool compressor, what does the low speed N1 compressor do?

A

Low pressure turbine drives low pressure compressor

40
Q

Stators in a turbine section changes the air flow in what way?

A

Increases velocity

41
Q

What does the cold section of a turbine engine consist of?

A

Inlet fan case, compressor, diffuser

42
Q

Why do turbines have more than one turbine wheel?

A

To catch all the kinetic energy

43
Q

What is meant by double entry centrifugal compressor?

A

Vanes on both sides of the impeller

44
Q

What should be done if an engine experiences a tail pipe fire?

A

Shut off fuel and continue cranking

45
Q

What can be used to write on a turbine?

A

Chalk, Layout dye, Commercial felt tip marker

46
Q

What is the purpose of the propagation tubes in a can-annular combustion section?

A

To transfer the flame

47
Q

What effect does humidity have on a jet engine?

A

Negligible

Powerplant (13 decks)

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