Question 1

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

Accepted Answer

A)  Housing
B)  Plenum
C)  Lower part
D)  Vacuum chamber

Question 2

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

Accepted Answer

A)  Oxygen sensor
B)  Exhaust temperature sensor
C)  Coolant temperature sensor
D)  Intake air temperature sensor

Question 3

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

Accepted Answer

A)  Silence the intake air noise
B)  Act as a flame arrester in case of a backfire
C)  Lower the intake air temperature
D)  Clean the air before it is mixed with fuel

Question 4

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?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 5

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

Accepted Answer

A)  5 to 10 microns
B)  40 to 50 microns
C)  30 to 40 microns
D)  10 to 25 microns

Question 6

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?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 7

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

Accepted Answer

A)  Port fuel injection
B)  Throttle body fuel injection
C)  Any fuel injected engine
D)  Both port injection and throttle body injection

Question 8

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

Accepted Answer

A)  Mass airflow (MAF) 
B)  Exhaust gas sensor (EGS) 
C)  Air temperature
D)  Throttle position sensor (TPS)  A

Question 9

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

Accepted Answer

A)  Speed
B)  Torque
C)  Flow resistance
D)  Power

Question 10

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 NOx emissions. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B D

Question 11

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

Accepted Answer

A)  Minimum high-RPM power
B)  Minimum low-RPM power
C)  Increased high-RPM power
D)  Increased low-RPM power

Question 12

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

Accepted Answer

A)  To increase low RPM torque
B)  To increase high RPM power
C)  To reduce exhaust emissions
D)  To heat the incoming air

Question 13

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

Accepted Answer

A)  9000
B)  7000
C)  2000
D)  4000

Question 14

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

Accepted Answer

A)  The amount of light that can pass through the filter
B)  The amount of restriction measured in inches of water
C)  Number of miles or vehicle travel
D)  Number of hours of engine operation B

Question 15

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?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 16

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

Accepted Answer

A)  To prevent damage to the intake valves
B)  To help prevent the exhaust from slowing down
C)  To prevent heating the air-fuel mixture in the cylinder
D)  Cool exhaust gas is more effective at controlling NOx emissions

Question 17

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

Accepted Answer

A)  100 feet per second
B)  25 feet per second
C)  300 feet per second
D)  50 feet per second

Question 18

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?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 19

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

Accepted Answer

A)  Uses a leaner air-fuel mixture than TBI
B)  Contains only air
C)  Contains only fuel
D)  Uses a heater to heat the intake air

Question 20

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?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Exam 24: Intake and Exhaust Systems

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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 NOx emissions. Who is right?

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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A

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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_xemissions. Who is right?

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D

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B

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