When a gas analyzer is properly warmed up and the probe is sampling ambient air, what should the O 2 level read? A. 0 percent B. Between 1 percent and 5 percent C. Between 20 percent and 21 percent D....

When a gas analyzer is properly warmed up and the probe is sampling ambient air, what should the O₂
level read?

A. 0 percent

B. Between 1 percent and 5 percent

C. Between 20 percent and 21 percent

D. About 78 percent

How would an ignition misfire affect the following gasses?

A. O₂
levels would be lower; CO and CO₂
levels would be higher.

B. CO₂
levels would be lower; O₂
and CO levels would be higher.

C. CO₂
and CO levels would be lower; O₂
levels would be higher.

D. CO₂
and O₂
levels would be lower; CO levels would be higher.