Compressor Function and Efficiency Quiz

What is an axial flow compressor?

• A compressor where air flows perpendicular to the axis of rotation

• A compressor where air flows parallel to the axis of rotation

• A compressor that only has one stage

• A compressor that does not increase pressure

What is the function of rotor assemblies in a compressor?

• To decrease the kinetic energy of the airflow

• To convert pressure into velocity

• To carry airfoil blades that impart kinetic energy to the airflow

• To block airflow completely

What is the purpose of variable stator vanes?

• To decrease compressor efficiency

• To adjust airflow angles and enhance compressor efficiency

• To increase the weight of the compressor

• To block airflow

What is the role of air straighteners in a compressor?

• To increase swirl in the airflow

• To direct airflow uniformly into the combustion chamber

• To block airflow

• To decrease airflow velocity

What is the definition of propulsive efficiency?

• The efficiency of converting fuel energy into heat

• The efficiency of converting fuel energy into thrust

• The efficiency of converting fuel energy into sound

• The efficiency of converting fuel energy into light

What is an integral drum in rotor structures?

• A component that combines blade and disc into one

• A rotor structure where blades and discs are welded into a single drum

• A type of engine that reduces maintenance

• A device that increases engine size

What is a blisk?

• A rotor structure that increases weight

• A combination of blade and disc into a single component

• A type of drum that improves stability

• A maintenance tool for larger engines

What is the operational role of a compressor in the field of turbomachinary?

What is the operational advantage of turbofans over turbojets?

• less weight and less volume therefore better at generating better L/D ratios

• Easier to assemble and manufacture

• Moves a larger volume of air thus generating adequate thrust for its operational requirement

• Less electronics and material so its comparable to the jack of all trades. Good at subsonic and transonic speeds.

Reorder the following sequence of components the airflow sees or interacts with as it enters the engine

• Combustion chamber

• Intake

• Turbine

• Stator Guide Vanes

• Compressor Fan