What forms as the result of the incomplete combustion of natural gas?

What forms as the result of the incomplete combustion of natural gas?

a. Ozone
b. Nitrogen
c. Aldehydes
d. Sulphuric acid

[Ques. 2] Natural-draft furnaces generally have efficiency ratings of _____.

a. below 65 percent
b. below 78 percent
c. below 85 percent
d. 90 percent and above

[Ques. 3] What type of flame is produced when about 50 percent of the required combustion air is mixed with natural
gas prior to ignition?

a. A cool flame
b. A yellow flame
c. A hard flame
d. A blue flame

[Ques. 4] Which condition would cause a humidifier to provide no moisture?

a. Open solenoid valve coil windings
b. Solenoid valve stuck open
c. Plugged drain line
d. Excessive water ham

[Ques. 5] Which statement about the operating sequence of an accessory is correct?

a. The operating sequence of one brand of air cleaner is often completely different from that of another
brand.
b. The operating sequence for all accessories is always extremely simple.
c. The operating sequences of similar accessories are often very similar.
d. Every type of humidifier requires that the furnace be producing hot air in order to function.

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What forms as the result of the incomplete combustion of natural gas?

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