🔍 Key Concepts

• Diffuser ring (blower/compressor) is the stationary ring of passages right after the impeller that converts air velocity into pressure. • On a turbocharger, the blower (compressor) side is opposite the exhaust turbine; look for the clean air path and volute casing. • The diffuser ring sits between the impeller eye and the outer volute scroll, usually shown as a ring of vanes or a shaped passage around the impeller.

💭 Think About

• On the illustration, first decide clearly which end is the compressor/blower and which end is the turbine/exhaust. • Trace the path of the air on the blower side: into the eye of the impeller, out radially, then through a ring-shaped passage before entering the scroll—where on the drawing is that ring-shaped diffuser located? • Compare the labels around the blower impeller: which letter points specifically to the stationary ring/passage that surrounds the outer edge of the impeller, not to the scroll casing or the rotating wheel itself?

✅ Before You Answer

• Be sure you are looking at the blower side, not the exhaust turbine side. • Confirm that the part you choose is stationary (part of the casing) and lies immediately outside the impeller exit, not the inlet or the shaft area. • Verify that the label you pick is pointing to the ring-shaped passage that guides flow from the impeller into the volute, not to bearings, seals, or the volute scroll itself.