IGT PO7.13&7.14

What are the advantages of axial gas compressors?

• Consumes more air.

• Design to attain much more higher pressure ratio.

• Improve efficiency.

• Improve specific fuel consumption.

Which type of compressor are most gas turbines using?

• Radial flow compressor

• Axial flow compressor

• Reciprocating compressor

• None of the above

In an axial flow compressor, what component is responsible for compressing the air?

• Impeller

• Shaft

• Rotor

• Combustion chamber

What is the primary role of the stator vanes in an axial compressor?

• Accelerate the air flow

• Decrease air pressure

• Convert kinetic energy into pressure

• None of the above

Which of the following is NOT a component of an axial gas turbine?

• Rotor

• Diffuser

• Combustion chamber

• Turbine

What is compressor surge?

• A normal increase in airflow

• A disruption causing airflow to reverse

• An increase in compressor efficiency

• A constant airflow through the compressor

How can compressor surge be prevented?

• Increasing air temperature

• Using variable inlet guide vanes

• Reducing the number of stages

• None of the above

What kind of flow pattern characterizes an axial turbine?

• Outward radial flow

• Parallel to the turbine/s axis

• Mixed flow

• Perpendicular to the turbines axis

What type of compressor is typically used when size and simplicity are prioritize over efficiency?

• Axial flow

• Centrifugal flow

• Reciprocating

• None of the above

In a centrifugal compressor, which component decelerates the air to increase pressure?

• Rotor

• Diffuser

• Compressor casing

• Impeller