🔍 Key Concepts

• Study how the turbocharger in the illustration connects the exhaust manifold to the air box (intake side). • Think about the energy flow: hot, high‑energy exhaust gas drives the turbine, which then compresses the intake air into the air box. • Consider what must be true about pressure on the turbine (exhaust) side versus the compressor (air box) side for the turbocharger to spin and deliver power.

💭 Think About

• Looking at the flow arrows, which side of the turbocharger contains the hotter, expanding gases that actually do the work on the turbine wheel? • For the turbine to transfer energy to the compressor, does the exhaust gas need to be at a higher or lower pressure than the compressed air in the air box? • At rated speed, would you expect the gases just leaving combustion to have more or less pressure than the air that has only been compressed once by the turbocharger?

✅ Before You Answer

• Identify clearly on the illustration which passages are exhaust manifold and which are air box/intake. • Ask yourself: for the turbine to keep spinning and driving the compressor, there must be a pressure drop across the turbine – verify which side of that turbine must be higher. • Eliminate any option that would prevent flow from exhaust to turbine or from compressor to air box (no flow if pressures were equal or backwards).