Worksheets9074/303 pp 9 Quiz on Burners and Draughts
Total questions: 15
Worksheet time: 8mins
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
What is the trend in burner design moving towards?
Pre-mixed burners
Open flame burners
Electric burners
Solar-powered burners
Which part is responsible for the primary air adjustment in a venturi burner?
Injector
Venturi throat
Aeration control shutter
Burner ports
What is the purpose of the throat restrictor in a venturi burner?
To block air flow
To adjust primary air
To increase pressure
To decrease speed
What is labeled as 'k' in the diagram?
Retention ports
Burner ports
Injector
Primary airport
Which type of appliance is likely to have a flue?
Room sealed/balanced draught
Atmospheric/natural draught
Mechanical draught
Central draught
