Co Tests on appliances other than gas cookers should be stopped and the area immediately ventilated and vacated if the CO reading exceeds

• 10ppm

• 15ppm

• 20ppm

• 30ppm

When completing a combustion analysis procedure to detect any presence of CO migration from other sources, over how long a period should the level of co be monitored.

• 5 minutes.

• 10 minutes.

• 15 minutes.

• 20 minutes.

Incomplete combustion from the burner of which appliance/appliances will cause an immediate danger?

• Flueless appliances.

• Open flued appliances

• Room sealed appliances

• All the above appliances

What is likely to be the consequence of a blocked air inlet grills of an open flued appliance?

What is the approximate quantity of primary air that will be entrained by a pre-aerated flame?

• 25%

• 50%

• 75%

• 100%

Which type of flame is luminous and ragged in shape, when working correctly?

The main constituent of natural gas is the hydrocarbon gas methane. Which of the following is a hydrocarbon fuel?

• Carbon Monoxide.

• Carbon Dioxide.

• Butane.

• Nitrogen.

What is the approximate volume of air required to completely burn 5m³ of natural gas?

• 15m³

• 25m³

• 50m³

• 100m³

Which of the following percentages of gas in air will not support the combustion of natural gas?

• 6% gas in air.

• 10% gas in air.

• 14% gas in air.

• 20% gas in air.

a vitiated air supply will produce carbon monoxide when the combustion of natural gas takes place within a space heater. What is vitiated air?