Chapter 24 Quiz

Why do many port fuel-injected engines use long intake manifold runners?

• To reduce exhaust emissions

• To heat the incoming air

• To increase high-RPM power

• To increase low-RPM torque    

Why are the EGR gases cooled before entering the engine on some engines?

• Cool exhaust gas is more effective at controlling NOx emissions    

• To help prevent the exhaust from slowing down

• To prevent damage to the intake valve

• To prevent heating the air-fuel mixture in the cylinder

Why is the catalytic converter placed as close to the engine as possible?

• For easier access when working on the engine

• So the heat can help the converter work most efficiently    

• To allow the exhaust pipes from the catalytic converter rearward to be as long as possible

• To prevent the heat from the exhaust system moving upward toward the floor of the vehicle

The upper portion of a two-part intake manifold is often called the ______________.

• housing

• lower part

• plenum

• vacuum chamber

Air filters can remove particles and dirt as small as ______________.

• 5 to 10 microns

• 10 to 25 microns

• 30 to 40 microns

• 40 to 50 microns

Technician A says that a cracked exhaust manifold can affect engine operation. Technician B says that a leaking lower intake manifold gasket could cause a vacuum leak. Which technician is correct?

• Technician A only

• Technician B only

• Both Technicians A and B

• Neither Technician A nor B

The ________ smooths out the pressure pulses in the exhaust system, allowing them to be released at an even and constant rate.

• exhaust manifold

• muffler

• intake manifold

• exhaust gas recirculation valve

Which of the following is/are terms for a variable intake manifold?

• Variable intake system (VIS)

• Variable volume induction (VVI)

• Dual-stage intake (DSI)

• Any of the above

The air filter restriction indicator uses what to detect when it signals to replace the filter?

• Number of hours of engine operation

• Number of miles of vehicle travel

• The amount of light that can pass through the filter

• The amount of restriction measured in inches of water

Technician A says that some intake manifolds are plastic. Technician B says that some intake manifolds are constructed in two parts or sections: upper and lower. Which technician is correct?

• Technician A only

• Technician B only

• Both Technicians A and B

• Neither Technician A nor B