🔍 Key Concepts

• Compare the internal shapes in figure "A" with each choice: lobes, vanes, or a centrifugal impeller wheel. • Think about what drives the device: is it turned by the engine crankshaft (mechanically) or by exhaust gas flow? • Recall that a turbocharger must have both a turbine (exhaust side) and a compressor (air side) on the same shaft.

💭 Think About

• Look closely at figure "A": do you see flat vanes sliding in and out of a rotor, curved blades on a spinning wheel, or a pair of intermeshing rounded rotors? • Ask yourself which option would require an exhaust turbine housing, and whether any exhaust passages are visible in figure "A". • For each answer choice, picture the typical cross‑section: which one best matches the multiple rounded elements shown and the straight-through air path indicated by the arrows?

✅ Before You Answer

• Verify whether figure "A" shows two or more intermeshing rotors (a clue to one specific type of blower). • Confirm that there is no exhaust gas turbine housing or separate exhaust path in figure "A" (that would rule out one option). • Check if the air seems to move around the outside of the rotors in pockets, rather than radially outward from the center like in a centrifugal blower.