Exam 24: Intake and Exhaust Systems

Some systems also have a(n) ________ sensor between the throttle body and the air cleaner.

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

Technician A says that exhaust manifolds can be made from hard plastic or aluminum. Technician B says that many intake manifolds have an EGR valve that regulates the amount of recirculated exhaust that enters the engine in order to increase NO_x emissions. Who is right?

Intake charge velocity has to be ________ to prevent fuel droplet separation.

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

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

Technician A says that the exhaust system also contains a catalytic converter, exhaust pipes, and muffler. Technician B says that the entire exhaust system is supported by metal hangers that isolate the noise and vibration of the exhaust from the rest of the vehicle. Who is right?

Exhaust passages are included in some intake manifolds. Technician A says that the exhaust passages are used for exhaust gas recirculation (EGR) systems. Technician B says that the upper intake is often called the plenum. Which technician is correct?

Manifold sizes represent a compromise. They must have a cross-section large enough to allow charge flow for a maximum amount of ________.

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

Shorter runners in a port fuel injected engine provide which of these?

A cracked exhaust manifold can cause false readings from which of these engine sensors?

Technician A says that intake manifolds are always made of metal. Technician B says that some intake manifolds are constructed in two parts or sections, upper and lower. Who is right?

The intake manifold of a port fuel-injected engine does which of these?

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?

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

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?

All of these are main jobs of the air cleaner and filter parts, EXCEPT ________.

The air/fuel mixture flows through the intake manifold on what type of system?

The automotive engine uses about ________ gallons of air for every gallon of gasoline burned at an air-fuel ratio of 14.7 to 1.