Combustion

Combustion is a chemical reaction that is often referred to as what type of reaction?

• Endothermic

• Exothermic

• Photosynthesis

• Electrolysis

What is the primary component of natural gas?

• Carbon Dioxide

• Ethane

• Methane

• Propane

What are the products of complete combustion?

• Carbon monoxide and water vapour

• Carbon dioxide and oxygen

• Carbon dioxide and water vapour

• Methane and carbon dioxide

What is produced in addition to water vapour during incomplete combustion of natural gas?

• Carbon dioxide

• Oxygen

• Carbon monoxide

• Methane

What are the two main types of flame relevant to the combustion process?

• Pre-aerated and post-combusted

• Pre-aerated and post-aerated

• Pre-combusted and post-combusted

• Pre-ignited and post-ignited

Which type of flame is most common in domestic gas appliances?

• Luminous flame

• Post-aerated flame

• Pre-aerated flame

• Secondary air flame

What is the appearance of a post-aerated flame?

• Blue with a clear inner cone

• Luminous

• Non-luminous

• Invisible

What is provided by the primary air in a pre-aerated flame?

• Some of the gas required for combustion

• Some of the air required for combustion

• The secondary air for combustion

• The ignition source for the gas

Which part of the flame is at the top of the burner and burner port, where the temperature of the air-gas mixture begins to rise?

• Reaction zone

• Outer mantle

• 1–2 zone

• 3–4 zone

Where is the reaction zone located in the flame diagram?

• At the top of the burner and burner port

• The outer mantle

• Between the 3–4 zone

• Between the 2–3 zone