The opening of the turbine housing where the exhaust gases enter is called the Inducer.

• A. Inducer
• B. Compressor A/R
• C. Trim
• D. Boost Pressure

Answer: (A)

In turbomachinery, the term inducer refers to the entry path of the fluid into a rotating wheel. For the turbine side of a turbocharger, exhaust gases enter the turbine housing through the turbine inlet and first meet the inducer region on the turbine wheel. That inducer edge helps draw the gas into the blades and start spinning the wheel efficiently.

The other terms don’t describe the entry point into the turbine housing: compressor A/R is about the geometry of the compressor side, not where exhaust gas enters the turbine; trim refers to altering the wheel’s mass or blade geometry to tune flow, not the inlet opening; boost pressure describes the pressure after compression, not the inlet path for exhaust gas. So this term correctly identifies the entry point into the turbine and the flow behavior as it starts to interact with the wheel.