🔍 Key Concepts

• Study the overall bowl assembly and think about how each part contributes to enclosing and supporting the disc stack. • Compare where label D is pointing relative to the spindle and disc stack to decide if it’s a central part (hub) or an outer enclosing part (hood/top/cover). • Consider typical purifier terminology: bowl hood, bowl top, bowl hub, bowl cover – and how each is usually shaped and located.

💭 Think About

• Is the component at D primarily an enclosing shell around the disc stack, or is it a central mounting/connection piece on the shaft? • Look at the extreme uppermost part of the bowl versus the central shaft connection at the bottom – which one would normally be called the hub, and which one would be a hood/top/cover? • If you removed the outer casing of the machine, which labeled part would still be considered part of the rotating bowl itself rather than the stationary machine housing?

✅ Before You Answer

• Verify that the part marked D rotates with the bowl and is not part of the stationary machine housing (cover). • Check whether the hub would logically be at the center where the bowl mounts to the spindle, not out on the perimeter. • Confirm that the terminology you pick is commonly used for the outer upper shell of the rotating bowl in centrifugal purifiers.