Refrigeration Plant Operator B Practice Test 2026 – All-in-One Guide to Exam Success

A centrifugal compressor operates by drawing air into an impeller, which is a rotating component, and then discharging it into a casing. This design allows for the conversion of kinetic energy generated by the impeller into pressure energy. As the impeller spins at high speed, it imparts velocity to the incoming air, which is then diffused into the casing where the air's velocity decreases, resulting in an increase in pressure. This process is efficient for moving large volumes of air or gas and is commonly used in various industrial applications, including refrigeration systems.

The other operational methods, such as using a rotary valve, pistons, or a screw mechanism, pertain to different types of compressors like rotary compressors, reciprocating compressors, or screw compressors, each of which has distinct working principles and applications.