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WorksheetsPhase 4 mod3
Total questions: 12
Worksheet time: 8mins
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?
(a)
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?
(a)
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?
(a)
Flame impingement can cause the production of carbon monoxide during combustion of natural gas. Flame impingement can be caused by:
Incorrect positioning of a burner
Inadequate ventilation air.
Excessive ventilation air.
Reduced burner pressure
Which of the following is the minimum concentration of carbon monoxide within the air that will cause occupants to fall victim to coma within a few minutes?
0.05%.
0.4%.
0.8%.
1.0%.
