🔍 Key Concepts

• Differences between hermetic, semi-hermetic, and open-drive refrigeration compressors • How the electric motor is arranged relative to the compressor (inside the shell vs. outside, directly visible) • What an external shaft coupling or drive guard looks like on a mounted compressor/motor set

💭 Think About

• Look closely at figure C: do you see a separate electric motor, or is the motor enclosed in the same housing as the compressor? • Is there any sign of a shaft, coupling, or drive guard between the motor and compressor, or is everything sealed inside one welded shell? • If you can see many bolts on the compressor body, what does that suggest about whether the unit is serviceable (can be opened) compared to a fully welded shell?

✅ Before You Answer

• Verify whether the motor is external and distinct from the compressor casing in figure C. • Check if the compressor housing appears bolted and openable, or if it is a smooth, welded shell with no large split flanges. • Match what you see with the definitions of hermetic, semi-hermetic, and open-drive drive arrangements before choosing your answer.