Refrigeration Plant Operator B Full Practice Test 2025

Question: 1 / 400

Which type of compressor utilizes an impeller to increase air pressure?

Rotary screw compressor

Centrifugal compressor

The type of compressor that utilizes an impeller to increase air pressure is the centrifugal compressor. This compressor functions by converting kinetic energy from the rotating impeller into pressure energy. As the impeller spins, it pushes the air outward, which increases its velocity. This high-velocity air is then directed into a diffuser, where the velocity is converted into pressure through a reduction in speed.

Centrifugal compressors are widely used in various applications, particularly for large-scale needs due to their efficiency at high flow rates and ability to compress gases continuously. They are particularly effective for high-flow, low-pressure applications, making them suitable for heating and cooling systems, as well as in specific industrial processes. Understanding this mechanism is critical for refrigeration plant operators, as it assists in making informed decisions about system design and operation.

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Diaphragm compressor

Reciprocating compressor

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