Engine Performance- Quiz 2 Mr C

two techs are discussing torque wrenches. Tech A says that a torque wrench is capable of tightening a fastener with more torque than a breaker bar or ratchet. Tech B says that a torque wrench should be calibrated regularly. Who is correct?

• Tech A

• Tech B

• Both

• Neither

the intake manifold of a port fuel injected engine.

• uses a dual heat riser

• contains a leaner air fuel mixture than does the intake manifold of a TBI system

• contains only fuel

• contains only air

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

• cool exhaust gases are 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 mix in the cylinder

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

exhaust passages are included in some intake manifolds. Tech A says that the exhaust passages are used for exhaust gas recirculation systems. Tech B says that the exhaust heat is used to warm the intake charge on some engines. Who is correct?

• Tech A

• Tech B

• Both

• Neither

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

• housing

• lower part

• plenum

• vacuum chamber

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

• Tech A

• Tech B

• Both

• Neither

Tech A says that some intake manifolds are plastic. Tech B says that some intake manifolds are constructed in two parts or sections. Who is correct?

• Tech A

• Tech B

• Both

• Neither

air filters should only be changed at manufacturers recommended intervals, not when dirty.

• true

• false

exhaust gases expand and cool as they pass through the muffler.

• true

• false