190204d Emissions Flashcards
1
Q
During perfect compilation. What would be produced.
A
Carbon dioxide and water
2
Q
Carbon monoxide (CO) is produced in combustion. There is more when?
A
Not enough oxygen
3
Q
NOx + hydrocarbons =?
A
Smog
4
Q
What is opacity?
A
The degree that smoke blocks light.
5
Q
EGR targets what gas
A
NOx
6
Q
EGR creates more?
A
Carbon monoxide (CO) and hydrocarbons (HC)
7
Q
DOC targets what gas
A
Carbon monoxide (CO) Hydrocarbons (HC)
8
Q
What metal is in a DOC?
A
Platinum or palladium
9
Q
Reactions occur in a DOC at what temp?
A
316-371 degrees C
10
Q
DPF trap what?
A
Particulate matter (soot)
11
Q
Passive regeneration is done when?
A
During normal operation.
12
Q
SCR targets what gas
A
NO and NO2 notirc oxides
13
Q
Where is DEF injected
A
Between the DPF and the SCR
14
Q
What % of DEF is urea
A
32.5%. Rest is water
15
Q
How long should it take to thaw a DEF tank
A
Within 1 hour of start up
