Exam 25: Turbocharging and Supercharging

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?

When air is pumped into the cylinder, the combustion chamber receives an increase of air pressure known as ________ and is measured in pounds per square inch (psi), atmospheres (ATM), or bar.

Boost pressure is generally measured in ________.

Two technicians are discussing the term "turbo lag." Technician A says that it refers to the delay between when exhaust leaves the cylinder and when it contacts the turbine blades of the turbocharger. Technician B says the term refers to the delay in boost pressure that occurs when the throttle is first opened. Who is right?

Many factory installed superchargers are equipped with a ________ that allows intake air to flow directly into the intake manifold bypassing the supercharger.

Technician A says that volumetric efficiency is a comparison of the actual volume of air-fuel mixture drawn into the engine to the theoretical minimum volume that can be drawn into the cylinder. Technician B says that a supercharger consumes some engine power as it forces a greater amount of air into the cylinders for more power. Who is right?

What is the purpose of an intercooler?

The term "volumetric efficiency" refers to the ability of an engine to ________.

Two types of superchargers include ________.

Nitrous oxide injection adds ________ allowing the engine to burn more fuel.

An engine designed to use nitrous oxide injection should have which of these features?

Technician A says that a stuck open wastegate can cause the engine to burn oil. Technician B says that a clogged PCV system can cause the engine to burn oil. Who is right?

All of these are advantages of supercharging an engine, EXCEPT ________.

Identify this component.

Which type of relief valve used on a turbocharged engine is noisy?

How are most turbochargers lubricated?

Which valve is used on a factory supercharger to limit boost?

Which of these is defined as the mass or weight of a substance in a given amount of space?

How are most superchargers lubricated?

What service operations is most important on engines equipped with a turbocharger?