Phase 3 Revision

What is the correct ratio of gas and oxygen required for complete combustion

• C4 + O2

• CH4 + CO2

• CH4 + 2O2

• CH4 + O2

What three components are required to create fire

• Oxygen + Fuel + Ignition

• Carbon Dioxide + Fuel + Ignition

• Carbon Monoxide + Fuel + Ignition

• Nitrogen + Fuel + Ignition

what is the correct ratio for complete combustion when CH4 + 2O2 =

• CO + H2S

• CH4 + CO2

• CO2 + 2H2O

• H2S + 2H2O

What is a sign of complete combustion of natural gas

• very tight yellow flame

• very tight blue flame

• vey floppy yellow flame

• Very floppy blue flame

Open Flue chimney system operates on what principle

• cold air which is more dense than hot air will rises and travel up the flue

• hot air which is more dense than cold air will rises and travel up the flue

• cold air which is less dense than hot air will rises and travel up the flue

• hot air which is less dense than cold air will rises and travel up the flue

what is the definition of a down draught diverter

•  form of draught break intended to prevent conditions in the main length of flue from interfering with the combustion performance of an open-flued appliance. It allows the appliance to operate without interference from adverse wind conditions and excessive draught.

• factory-made counter-balanced flap device admitting air to the flue, from the same space as the combustion air, to prevent excessive variations in the draught. It is usual for these to be in the fluepipe or chimney, but they may be located on the appliance.

what is the definition of a draught stabiliser

• is a form of draught break intended to prevent conditions in the main length of flue from interfering with the combustion performance of an open-flued appliance. It allows the appliance to operate without interference from down-draughts that may occur in adverse wind conditions and excessive draught.

• is a factory-made counter-balanced flap device admitting air to the flue, from the same space as the combustion air, to prevent excessive variations in the draught. It is usual for these to be in the fluepipe or chimney, but they may be located on the appliance.

what is the height of a flue chimney system next to an adjacent structure

• 600mm

• 1200mm

• 900mm

• 300mm

what test is used to check flue integrity

• flue flow

• spillage

what test is used to confirm safe operation of an open flue boiler flue system when it is switched on

• flue flow

• spillage