9074/303 pp 8

Where should gas and carbon monoxide detectors be placed?

• Near windows

• In the basement

• Near sleeping areas

• Outside the house

What are visible warning signs associated with incomplete combustion?

• Blue flame

• Yellow or orange flame

• No flame

• Green flame

What is flame impingement?

• When flames impede one another on a gas burner bar

• When flames burn out completely

• When flames are extinguished by water

• When flames are used for cooking

What does a yellow, loose, and floppy flame indicate in a combustion process?

• Complete combustion

• Excess air in the combustion process

• Lack of air in the combustion process

• High efficiency

What does a stable blue flame typically indicate?

• Incomplete combustion

• Complete combustion

• Excessive soot production

• Low temperature

What risk is associated with the operation of a gas appliance showing signs of staining and dampness?

• Electrical shock

• Carbon monoxide poisoning

• Water leakage

• Fire hazard

What is the role of the flue in a gas appliance?

• To heat the room

• To vent combustion products

• To store gas

• To cool the appliance

What is the purpose of lint arresters in open-flued appliances?

• To prevent lint from interfering with combustion.

• To increase the temperature of combustion.

• To reduce noise during operation.

• To enhance the aesthetic appearance.

What is carbon monoxide?

• A visible by-product of complete combustion

• A deadly invisible by-product of incomplete combustion

• A harmless gas produced by plants

• A visible by-product of photosynthesis

What is the effect of carbon monoxide on oxygen in the blood?

• Increases oxygen levels

• Depletes oxygen levels

• Has no effect on oxygen

• Enhances oxygen transport