What are the three components required for fire according to the principles of combustion?

• Fuel, Oxygen, Heat

• Water, Oxygen, Heat

• Fuel, Water, Light

• Oxygen, Water, Spark

Combustion is a chemical reaction with which element?

• Nitrogen

• Oxygen

• Carbon

• Hydrogen

What is produced when propane, oxygen, and a spark are combined?

• Water

• Smoke

• Flame

• Ice

Which of the following is described as one of the most destructive elements that exists?

• Water

• Fire

• Air

• Earth

Which of the following is a common gas used in plumbing situations?

• Oxygen

• Natural gas

• Carbon dioxide

• Nitrogen

What is the relative density of natural gas?

• 0.58

• 1.78

• 2.0

• 1.00

Which gas has the highest calorific value among natural gas, propane, and butane?

• Butane

• Propane

• Natural gas

• Methane

What is the approximate air/gas ratio for propane?

• 24:1

• 10:1

• 30:1

• 15:1

Which gas produces the highest flame temperature?

• Butane

• Propane

• Natural gas

• Methane

What is the calorific value of natural gas?

• 38.5MJ/m³

• 95.0MJ/m³

• 121.5MJ/m³

• 50.0MJ/m³