Air Induction And Exhaust Systems

Question 1

What is central purpose of an air induction system?

Answer 1

Supply the engine with an ample supply of cool, clean air for combustion

Question 2

An air induction can be composed of what parts?

Answer 2

Air cleaner(s), Pre-cleaner(s), Air filter(s), Dust ejection system(s), restriction indicator, filter housing(s), Inlet tubing, Clamp, Hoses, Cold/hot air intake systems, Manifold(s) and gaskets, Shutdown devices

Question 3

What are the main functions of the air induction system?

Answer 3

Cleans the air supply, Silences the inlet airflow, Provides air for combustion, Cools air, it allows extra airflow when blowers and turbo’s are used.

Question 4

Maximum engine performance occurs when air is less then?

Answer 4

33 C

Question 5

2 stroke engines are considered to be:

Answer 5

Naturally aspirated, unless equipped with turbo

Question 6

Engines without a turbocharger are considered to be?

Answer 6

Naturally aspirated

Question 7

What factor can limit the volumetric efficiency of a engine?

Answer 7

Engine operating speed, Air humidity, Air temperature, Altitude, Liner and ring condition, Valve adjustment and cam condition, Air filter and inlet tubing condition

Question 8

Naturally aspirated engines may have a volumetric efficiency of?

Answer 8

75-85%

Question 9

Pre cleaners may be able to remove what percentage of large particles?

Answer 9

80%

Question 10

What is called when exhaust gases cause the dust ejectors to dump?

Answer 10

Exhaust gas aspirator

Question 11

What are the two types of air filter assemblies?

Answer 11

Wet or Oil bath

Dry type

Question 12

How effective are each of the different types of air filter assemblies ?

Answer 12

Oil bath - up to 98.5%

Dry type - up to 99.5%

Question 13

Dry filters are commonly constructed of what?

Answer 13

Pleated paper

Question 14

Screw on constant torque clamp must extend how far?

Answer 14

1/4”

Question 15

Seals and gaskets should:

Answer 15

Be replaced when components are disconnected

Question 16

Air shutdown devices should only be used when?

Answer 16

In a emergency situation

Question 17

Air shutdown devices should be inspected on a regular basis for?

Answer 17

Condition and freedom of movement

Question 18

Components used in an exhaust system can include?

Answer 18

Manifolds and gaskets, Piping, Mufflers, Catalytic converters, particulate traps, Heat shields, Spark arrestors

Question 19

When an exhaust system is routed past a cab or sleeper:

Answer 19

Components must be secure, leak free, quiet and not create vibrations

Question 20

Exhaust manifolds are commonly constructed of what?

Answer 20

Cast iron

Question 21

Straight through muffler

Answer 21

Allows exhaust gases to pass directly through a central tube in the muffler

Question 22

Reverse flow muffler

Answer 22

Cause the exhaust gases to change direction as they pass through the inside of the muffler

Question 23

Mufflers are typically constructed of?

Answer 23

Mild steel although stainless is becoming more common

Question 24

Exhaust stack

Answer 24

is the point at which the exhaust gases leave the exhaust system

Question 25

Stacks can sometimes have what? what is purpose?

Answer 25

Rain cap. Keep water and other contaminates out of the exhaust system

Question 26

80% of cylinder wear related to contaminated air can be prevented by?

Answer 26

An effective pre-cleaner

Question 27

When ideal combustion does not occur exhaust gases can include?

Answer 27

Carbon monoxide, Unburned fuel, Oxides of nitrogen, Carbon

Question 28

12 ounces of dirt has the ability to?

Answer 28

Destroy an engine

Question 29

Loose, missing or incorrect fasteners on an exhaust system are likely to cause?

Answer 29

Leakage problems

Question 30

A faulty induction or exhaust system can cause what 3 major problems?

Answer 30

Lack of power Black smoke Premature engine wear

Question 31

Blue smokes tends to indicate what?

Answer 31

Oil is being burnt

Question 32

Incomplete combustion is generally the result of what?

Answer 32

Incomplete combustion

Question 33

What is the purpose of a pre-cleaner

Answer 33

Remove large dirt and dust particles from the incoming air stream, reducing the load on the main air filter

Question 34

What is the primary function of the exhaust system?

Answer 34

Gather exhaust gases from cylinders, direct them to silencing mechanism, then disperse them to atmosphere

Question 35

T/F Fibreglass packing is used in some mufflers to absorb sound waves?

Answer 35

True

Question 36

What device is used for testing restrictions on an air induction system?

Answer 36

Water manometer