Compressor Chapter 3

"A stage" of an axial-flow compressor consists of _____________ and ___________

• Impeller and Stator

• Stator and Rotor

• Impeller and Rotor

• Guide vane and stator

As air flows through the axial flow compressor rotor blades, its _______________.

• pressure and absolute velocity decreases

• pressure and absolute velocity increases

• pressure decreases and absolute velocity increases

• pressure increases and absolute velocity decreases

What is the purpose of the diffuser section just before the combustion chamber in a turbine engine?

• To convert pressure to velocity.

• To increase pressure and reduce velocity.

• To reduce pressure and increase velocity.

• To speed up the air flow in the combustor section.

At what point in an axial flow turbojet engine will the highest gas pressures occur?      

• At the compressor outlet.  

• At the turbine entrance.

• At combustor inlet

• At the turbine exist.

The purpose of the variable inlet guide vanes is to  prevent ______________ .

• FOD entering the compressor

• engine flame out at high speed

• compressor from overspeed

• compressor from stalling

A twin-spool turbojet engine has a compression ratio of 36. if the low pressure compressor has a pressure ratio of 4, calculate the high pressure compressor pressure ratio?

• 1/9

• 9

• 40

• 144

Which of the following is TRUE about the axial flow compressor?

• It has low peak efficiencies.

• It is easy to manufacture and low cost.

• It required low starting power.

• It is susceptible to foreign object damage.

Refering to the figure, what is the A and B?

• A - Absolute Velocity, V1

  B - Swirl Velocity, Vw1

• A- Swirl Velocity, Vw1

  B - Axial Velocity, Va

• A - Relative Velocity, Vrel1

  B - Axial Velocity, Va

• A - Axial Velocity, Va

  B - Swirl Velocity, Vw2

Name this component.

• Compressor Casing

• Centrifugal Compressor

• Diffuser Casing

• Compressor Manifold

What are the three main components of a centrifugal compressor?

• Impeller, Diffuser and Compressor Manifold

• Stator, Diffuser and Compressor Manifold

• Rotor, Diffuser and compressor manifold

• Impreller, Stator and Rotor