Module 3.1 Knowledge Questions Flashcards
A vitiated air supply will produce carbon monoxide when the combustion of natural gas takes place within a space heater. What is vitiated air?
Answer: ………………
Air which has a lack of oxxygen
When completing a combustion analysis procedure to detect any presence of CO, over how long a period should the level of CO be monitored?
a 5 minutes
b 10 minutes
c 15 minutes
d 20 minutes
c 15 minutes
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?
a 0.05%.
b 0.4%.
c 0.8%.
d 1.0%.
b 0.4%.
What is the approximate volume of air required to completely burn 5m3 of natural gas?
a 15m3.
n 25m3.
c 50m3.
d 100m3.
c 50m3.
What is the approximate quantity of primary air that will be entrained by a pre-aerated flame?
a 25%.
b 50%.
c 75%.
d 100%.
b 50%.
Which type of flame is luminous and ragged in shape, when working correctly?
Answer…….
Post-aerated flame
Which of the following percentages of gas in air will not support the combustion of natural gas?
a 6% gas in air.
b 10% gas in air.
c 14% gas in air.
d 20% gas in air.
c 20% gas in air.
CO tests on appliances other than gas cookers should be stopped and the area immediately ventilated and vacated it the CO reading exceeds:
a 10ppm
b 15ppm
c 20ppm
d 30ppm
d 30ppm
Flame impingement can cause the production of carbon monoxide during combustion of natural gas. Flame impingement can be caused by:
a Incorrect positioning of a burner.
b Inadequate ventilation air.
c Excessive ventilation air.
d Reduced burner pressure.
a Incorrect positioning of a burner.
What is likely to be the consequence of blocked air inlet grills of an open flued appliance?
Answer…………
Incomplete combustion
The main constituent of natural gas is the hydrocarbon gas methane. Which of the following is a hydrocarbon fuel?
a Carbon Monoxide.
b Carbon Dioxide.
c Butane.
d Nitrogen.
c Butane.
