Gas Appliance Combustion L3P3,U11,AC2.3.

What is the ratio of oxygen to natural gas required for complete combustion?

• 1:1

• 2:1

• 4:1

• 3:1

What can cause incomplete combustion due to insufficient air supply?

• Flame impingement

• Lack of oxygen

• Vitiated air

• Too much fuel

What is the problem with flame impingement in gas appliances?

• It creates an oxygen/carbon dioxide imbalance

• It leads to oxygen starvation

• It causes carbon monoxide production

• It results in incomplete combustion

• Causes flame chilling and allows the build up of soot

What can lead to vitiated air in a room with gas appliances?

• Sudden cooling effect of the combustion chamber

• Flame impingement

• Too much fuel at the appliance

• Insufficient air supply

What is the consequence of vitiated air in a room with open flued gas appliances?

• Lack of combustion oxygen

• Soot buildup in the combustion chamber

• Incomplete combustion of the gas

• Carbon monoxide production