ESCO Air Conditioning Practice Exam

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

1. Absorption compressor

2. Centrifugal compressor

3. Open drive compressor

4. Scroll compressor

The correct answer is: 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.