Gas Turbine Engine Quiz 2

What are the two functional elements of a centrifugal compressor?

• Impeller and diffuser

• Bucket and expander

• Turbine and compressor

• Compressor and manifold

The two types of compressors most used in jet engines are

• Axial and root

• Centrifugal and axial

• Root and centrifugal

• Centrifugal and reciprocating

Newton’s Law of Motion, generally termed the “Law of Momentum”, states:

• Acceleration is produced when a force acts on a mass. The greater the mass, the greater amount of force needed

• For every equal action there is an equal and opposite reaction.

• A body persist in its state of rest, or of motion in a straight line, unless acted upon by some outside force

• A total energy in a steadily flowing fluid is constant

What is the function of the inlet guide vane assembly on an axial-flow compressor?

• Directs the air into the first stage rotor blades at the proper angle

• Converts velocity energy into pressure energy

• Converts pressure energy into velocity energy

• It changes either the velocity or the pressure of the inlet air

The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine, are called

• Pressurization vanes

• Axial vanes

• Stator Vanes

• Bleed Vanes

The stator vanes in an axial-flow compressor

• Directs the air into the first stage rotor blades at the proper angle

• Converts velocity energy into pressure energy

• Converts pressure energy into velocity energy

• It changes either the velocity or the pressure of the inlet air

The two types of centrifugal compressor impellers are

• single entry and double entry

• axial and centrifugal

• impeller and diffuser

• rotor and stator

How does a dual axial-flow compressor improve the efficiency of a turbojet engine?

• Most turbine wheels can be used

• Higher compression ratios can be obtained

• The velocity of the air entering the              combustion chamber is increased

• increase cooling in the compressor

What is the primary advantage of an axial-flow compressor over a centrifugal compressor?

• High frontal area

• Less expensive

• Aesthetically pleasing

• Greater pressure ratio

The compressor stators in a gas turbine engine act as diffusers to

• decrease the velocity of the gas flow

• increase the velocity of the gas flow

• increase the velocity and decrease the pressure of the gas

• maintain the velocity of the gas flow