ESCO Air Conditioning Practice Exam 2025 – Complete Study Resource

Question: 1 / 400

A mechanical shaft seal is necessary on which type of compressor?

Absorption compressor

A mechanical shaft seal is necessary on an absorption compressor because absorption compressors use a refrigerant and absorbent liquid that need to be kept separate to function properly. A mechanical shaft seal prevents any leakage between the two liquids, ensuring efficient and safe operation. The other options, such as a centrifugal compressor, open drive compressor, and scroll compressor do not require a mechanical shaft seal because they do not use two separate liquids in their operation. A centrifugal compressor works by rotating an impeller, creating a high-velocity flow of air or gas. An open drive compressor is similar, but the motor is mounted outside of the compressor housing. A scroll compressor uses two spiral-shaped components to compress air or gas. None of these compressor types require a mechanical shaft seal for their proper operation.

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Centrifugal compressor

Open drive compressor

Scroll compressor

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