Characteristics of Combustion Flashcards
Properties and characteristics of natural gas ,Combustion process,
The main constituent of natural gas is the hydrocarbon gas methane. Which of the following is hydrocarbon fuel?
carbon monoxide ,carbon dioxide, butane, nitrogen
Butane
What is the approximate volume of air required to completely burn 5mcube,of natural gas.
50mcube
Which of the following percentages of gas in air will not support the combustion of natural gas? .6% gas in air .10% gas in air .14% gas in air .20% gas in air
.20% gas in air
What is vitiated air
Lack of oxygen
Flame impingement can cause the production of CO during combustion of natural gas. Flame impingement can be caused by?
Incorrect positioning of a burner
Which of the following is the minimum concentration of carbon monoxide with in the air that will cause occupants to fall victim to coma with in a few minutes.?
0.4%
Which type of flame is luminous and ragged in shape , when working correctly?
Post aerated flame
What is the approximate quantity of primary air that will be entrained by a pre aerated flame.?
50%
What is likely to be the consequence of blocked air inlet grills of an open flued Appliance?
Production of carbon monoxide, (incomplete combustion)
Incomplete combustion from the burner of which appliances will cause an immediate danger?
Flueless Appliances
When completing a combustion analysis procedure to detect any presence of CO migration from the source, over how long a period should the level of CO be monitored?
15 minutes
CO tests on Appliances other than gas cookers should be stopped and the area immediately ventilated and vacated if the CO reading exceeds?
30ppm
