9189 Phase 3 Combustion And Ventilation Revision Quizz

What are the three elements required for combustion to occur?

• Fuel, water, and ignition

• Fuel, oxygen, and ignition

• Oxygen, water, and ignition

• Fuel, carbon dioxide, and ignition

What is produced during complete combustion of hydrocarbons?

• Carbon monoxide and water vapor

• Carbon dioxide and water vapor

• Oxygen and carbon monoxide

• Hydrogen and carbon dioxide

What happens during incomplete combustion?

• All carbon is turned into carbon dioxide

• Carbon monoxide is produced due to insufficient oxygen

• Only water vapor is produced

• Complete combustion occurs

What type of flame is produced when combustion is complete?

• A stable blue flame with a bright blue inner cone

• A loose yellow flame

• A red flame with a dark outer cone

• A green flame with a bright outer cone

What is the main characteristic of a post-aerated flame?

• It is smaller than a pre-aerated flame

• It has a well-defined inner cone

• It takes air for combustion from the surrounding atmosphere

• It is used in domestic gas appliances

What does "pre-aerated" mean in the context of flames?

• Air is drawn for combustion after the flame is lit

• Air is entrained in the mixing tube before ignition

• Air is mixed with gas after leaving the burner

• Air is not involved in the combustion process

Which type of flame is most commonly used in domestic gas appliances?

• Post-aerated flame

• Pre-aerated flame

• Neutral flame

• Luminous flame

What is one of the causes of incomplete combustion in appliances?

• Excessive oxygen supply

• Lack of oxygen

• High humidity

• Low temperature

What does the term 'vitiated air' mean?

• Air that is too dry

• Air that is too cold

• Air that has been made impure

• Air that is too humid

What is a sign of incomplete combustion in an appliance?

• Blue, steady flame

• Yellow, floppy flame

• Green, flickering flame

• Red, stable flame