Technician A says that a wastegate is used on most turbocharger systems to limit and control boost pressures. Technician B says that a relief valve is also used to keep the speed of the turbine wheel from speeding up during engine deceleration. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct because a wastegate is indeed used in turbocharger systems to control and limit the boost pressure by diverting some exhaust flow away from the turbine wheel, preventing it from spinning too fast and generating excessive boost. Technician B is incorrect because the primary function of a relief valve (or blow-off valve) in a turbocharged engine is to prevent compressor surge, not to control the turbine wheel speed during deceleration.

Technician a Says That a Wastegate Is Used on Most