9074/303 pp 9 Quiz on Burners and Draughts

What is the part of the appliance on which the flame stabilizes?

• Burner

• Boiler

• Cooker

• Water heater

Which of the following appliances may have a burner?

• Fire

• Refrigerator

• Air conditioner

• Washing machine

What is the primary air intake used for in a pre-aerated flame?

• To draw in air for combustion

• To release exhaust gases

• To supply water

• To provide electricity

What is the main component of the outer mantel in a pre-aerated flame?

• Metal

• Plastic

• Wood

• Glass

What is a characteristic of a post-aerated flame?

• It has primary air mixed with the gas prior to combustion.

• It produces a blue flame.

• It has no primary air mixed with the gas prior to combustion.

• It is more efficient than pre-aerated flames.

What occurs when the gas/air speed is slower than the flame speed?

• Flame lift

• Light back

• Flame spread

• Flame extinguish

What is the effect of friction caused by the gas/air mixture along the edge of the mixing tube?

• Increases flame speed

• Decreases flame speed

• Stabilizes the flame

• Causes turbulence

What is the main purpose of the flame front in a burner system?

• To extinguish the flame

• To stabilize the flame

• To initiate combustion

• To cool the gas

What is the purpose of the retention port in a burner?

• A) To increase gas flow

• B) To prevent 'flame lift'

• C) To reduce air pressure

• D) To enhance heat output

What happens if flame lift occurs?

• A) The flame will extinguish

• B) The flame will lift off

• C) The flame will become brighter

• D) The flame will reduce in size