190204d Emissions Control/After Treatment System

Question 0

API stands for

Answer 0

American Petroleum Institue

Conducts research and verifes info for petroleum industry

Question 1

What does EPA stand for?

Answer 1

Environmental Protection Agency

Sets emission standards for hydrocarbon powered engines

Question 2

In 2002 EGR regulations mandated ___ reduction in the ________ of ______

Answer 2

50%

NOx oxides of nitrogen

Question 3

The combinations of using EGR and retarted injection timing to reduce NOx in a loss of what?

Answer 3

Loss of power and reduced fuel economy.

Question 4

A negative effects of EGR is that it causes an in crease of CO and HC this requires additional after treatment usallu in the form of?

Answer 4

DOC

Diesel oxidation catalist

Question 5

What are 2 types basic types of EGR valves

Answer 5

Butterfly and poppet

Question 6

The regulatory body that sets emission levels for North American diesel engines is

Answer 6

The EPA. Environmental protection agency

Question 7

Initial EPA Tier 4 emissions were introduced for off-road equipment engines in what year

Answer 7

2011

Question 8

To be compliant with EPA 2007 emission regulations, a highway tractor must be equipped with an EGR system and a

Answer 8

DPF

Question 9

In the EGR system, the VDT is controlled by the ECM to vary

Answer 9

Exhaust back pressure

Question 10

With the EGR system, introducing exhaust gas into the intake manifold is done to reduce the engines

Answer 10

Combustion pressure and temperature

Question 11

The cooling system on an engine equipped with the EGR system has a greater heat loading because of

Answer 11

Exhaust gases must pass through a water cooled heat exchanger

Question 12

To obtain EGR flow, the VGT turbocharger nozzle vanes would have to be

Answer 12

Partially closed

Question 13

A particulate trap is used to remove what emissions from a diesel engines exhaust

Answer 13

Soot

Question 14

The DOC in the exhaust aftertreatment module reacts with injected hydrocarbons to do what

Answer 14

Create additional heat for DPF regeneration

Question 15

To monitor operation of the exhaust aftertreatment module on a DPF equipped diesel engine, there are temperature sensors at.

Answer 15

The DOC Inlet, DOC outlet and DPF outlet

Question 16

If the yellow DPF lamp is illuminated solid the operator should

Answer 16

Increase the duty cycle and load on the engine

Question 17

If the suit loading on a DPF rises above 80% the engine will

Answer 17

Undergo a severe De-rate and shut down

Question 18

To prevent damage to the filter core. a diesel engine equipped with a DPF must use

Answer 18

ULSD ultra low sulfur diesel

Question 19

A plugged DPF or DOC can cause

Answer 19

Excessive exhaust system back pressure

Question 20

If a dosing valve is used on an engine equipped with a DPF. The purpose of this dosing valve is to supply what

Answer 20

Hydrocarbons to react with the DOC

Question 21

During regeneration, the DPF converts spot emissions to harmless compounds of what

Answer 21

CO2 and NO

Question 22

How do you remove the trapped ash from the DPF

Answer 22

With an off vehicle cleaning process at periodic intervals

Question 23

During a regeneration cycle, the outlet exhaust temperature of the DPF system will reach

Answer 23

593°C or 1100°F

Question 24

The ECM determines when the soot level in the DPF is excessive by monitoring what signal

Answer 24

The differential pressure sensor signal

Question 25

On a DPF system, the HEST lamp is usually illuminated when.

Answer 25

During a regeneration cycle

Question 26

That SCR system is primarily used to reduce emissions of what

Answer 26

NOx

Question 27

a DPF soot loading level of 60% is indicated by what

Answer 27

A moderate engine de-rate and a flashing yellow DPF lamp

Question 28

DEF is sprayed in before the catalytic converter on an SCR system where it mixes with the hot exhaust gases and is converted into

Answer 28

Ammonia and CO2

Question 29

After the ammonia and exhaust gases pass through the SCR catalytic converter, the NOx emissions are converted to

Answer 29

Nitrogen and water vapor

Question 30

The industry standard for DEF is a solution of

Answer 30

32.5% urea and 67.5% distilled water

Question 31

How much carbon is in smog after the combustion process

Answer 31

40%

Question 32

What is opacity

Answer 32

The degree in which smoke blocks light

Question 33

Active regeneration requires what to be injected into the exhaust stream ?

Answer 33

Hydrocarbons (deisel fuel)

Question 34

If the fluid level in the SCR reservoir gets below the minimum level, the ECM will warn the operator and

Answer 34

De-rate the engine

Question 35

The SCR metering module sends a specific quantity of DEF to the dosing module based on

Answer 35

Engine load and exhaust temperature

Question 36

2007 on highway truck engine must use oil that meets API ________ ? specifications to be compatible with the exhaust aftertreatment devices

Answer 36

CJ4

Question 37

When following manufacture specs, what mods are allowed on the exhaust system on a system with an SCR

Answer 37

Tailpipe modifications

Question 38

Besides "cow farts" what are some emissions related to greenhouse gasses

Answer 38

N0x , C0, and C02.

Question 39

The EGR valve controls the gas flow to the cooler by opening up the butterfly valve which is positioned by

Answer 39

An air operated actuator

Question 40

TQ. During active regen what do the hydro carbons react with in the doc to produce heat ?

Answer 40

They react with the catalysts in the doc core (exhaust gas outlet temps will reach 593 C (1100 F)

Question 41

TQ. Active regeneration can be initiated 3 ways, what are they ?

Answer 41

ECM , DPF dash switch , | Engine manufacturer's diagnostic program or electronic service tool

Question 42

What controls the Dosing Valve during regeneration process ?

Answer 42

ECM

Question 43

How many temperature sensors do the DOC and DPF have ?

Answer 43

Three (DOC inlet and outlet/DPF inlet) (DPF outlet)

Question 44

How many pressure sensors does the DPF have ?

Answer 44

Two (inlet and outlet)

Question 45

The combination of using EGR and retarded injection timing to reduce NOx would result in

Answer 45

Loss of power and reduced fuel economy

Question 46

TQ. What events occur when DPF soot loading reaches 80% ?

Answer 46

DPF light flashing, check engine light comes on and begins to de-rate engine. The DPF is at Maximum capacity. Operator must park unit and force regeneration with dash switch.

Question 47

Diesel engines create particulate matter. 3 main sources are ?

Answer 47

Unburnt fuel ash from diesel fuel soluble organic fractions (sof)