Chapter 25 quiz

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

• Tech A

• Tech B

• Tech A and B

• Neither tech A or B

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. Which technician is correct?

• Tech A

• Tech B

• Both Tech A and B

• Neither Tech A or B

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

• Oxygen
• Nox

• HC

• CO2

The term “volumetric efficiency” refers to the ability of an engine to ______________ .

• create emissions

• create heat

• pull in air

• distribute air evenly

How are most superchargers lubricated?

• By engine oil under pressure through lines from the engine

• By an internal oil reservoir

• By greased bearings

• No lubrication is needed because the incoming air cools the supercharger

Boost pressure is generally measured in ______________ .

• inch Hg

• PSI

• inch H2O

• inch pound

How are most turbochargers lubricated?

• By engine oil under pressure through lines from the engine

• By an internal oil reservoir

• By greased bearings

• No lubrication is needed because the incoming air cools the supercharger

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

• Replacing the air filter regularly

• Replacing the fuel filter regularly

• Regular oil changes

• Regular exhaust system maintenance

What is the purpose of an intercooler?

• To reduce the temperature of the air entering the engine

• To cool the turbocharger

• To cool the engine oil on a turbocharged engine

• To cool the exhaust before it enters the turbocharger

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

• A bypass valve

• A wastegate

• A blow-off valve

• An air valve