February 2011 Five Minute Quiz
30th January 2011The topic for this month is CFBT (Compartment Fire Behaviour Training). Answers are available below.
1) Vapour or gases can burn with two types of flame, what are they?
2) What is pyrolysis?
3) Define Auto Ignition Temperature (AIT)
4) What is the AIT of acetylene?
5) What is the flammable range for acetylene (at standard 25C and sea-level atmospheric pressure) in a pre-mixed fuel/air mixture?
6) What is the flammable range for propane?
7) What is the effect on the flammability range when there is an increase of temperature?
8) What does a smoke plume consist of?
9) There are four broadly categorised stages of fire development, what are they?
10) Define a concealed ignition source
ANSWERS:
1) Pre-mixed & Diffusion 2) The chemical breakdown of a substance into flammable gases due to heat. 3) The temperature at which the air/fuel mixture will ignite spontaneously without the application of a spark or pilot light. 4) 100C 5) 2% - 80% 6) 2% - 10% 7) A reduced Lower Flammable Limit (LFL), an increased Upper Flammable Limit (UFL), widening of the flammability range. 8) Entrained air, nonflammable products of combustion (carbon dioxide, water vapour etc), unburnt fuel, pyrolysis products. 9) Incipient, growth (including flashover), fully developed, decay. 10) The ignition source is not directly exposed to the flammable atmosphere.