Fire_spread_study_guidance

I need to understand following type of questions

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Questions samples are
QUESTION 1
1. A fire is burning in a 30mx30mx5m (length, width, height) auditorium at the rate of 0.2kg/s and has a Carbon Monoxide Yield of 0.1. Assume that the products of combustion are well mixed throughout the space and the density of air to be 1.2kg/m3:
a. How long would it take for the hot layer to reach a Carbon Monoxide concentration that would lead to incapacitation after 5min exposure?




QUESTION 2
1. A fire is burning in a 30mx30mx5m (length, width, height) auditorium at the rate of 0.2kg/s and has a Carbon Monoxide Yield of 0.1. Assume that the products of combustion are well mixed throughout the space and the density of air to be 1.2kg/m3:
a. How long before the Carbon Monoxide concentration was lethal after a very short exposure?



QUESTION 3
1. Hot gases at 900˚C from a fire are flowing past a plasterboard wall whose exposed surface has already been heated to 100˚C, how much heat flux is transferred from the hot gases to the wall per square metre if the heat transfer coefficient is 15W/K m2?



QUESTION 4
1. Hot gases at 900˚C from a fire are flowing past a plasterboard wall whose exposed surface has already been heated to 100˚C. If the effective emissivity of the hot gases is 0.8 and the emissivity of the plasterboard wall is 0.9 in the above question, how much net radiant energy flux is transferred per square metre to the wall?




QUESTION 5
1. An upholstered lounge which is burning in the middle of a room of a size of 5mx4mx3m (length, width, height) catches fire from a piloted ignition source. Assuming that the diameter of the lounge is 1m calculate the size of the burning (Heat release rate) required for its flame to reach the ceiling level. [You can ignore the height of the lounge for this calculation]





QUESTION 6
1. An upholstered lounge burning in the middle of a room of a size of 5mx4mx3m (length, width, height) catches fire from a piloted ignition source. If the heat of combustion of the lounge material is 18 kJ/g calculate the mass regression rate corresponding to the heat release rate estimated for Question 5.



QUESTION 7
1. Calculate the time for a flame to spread from the bottom to top of a piece of paper 400 mm long held at an angle of 22.5o to the horizontal and also at an angle of 75o to the horizontal. Provide a brief description as to why there is a difference in these times.



QUESTION 8
1. In the AS1530.2 flammability test a 76 mm wide strip of material is subjected to ignition by a flame near the base of a 534 mm long vertical specimen in a laboratory at 20oC. The flame reached the top of the specimen in 8 seconds.
a.i What is the rate of flame spread?
a.ii How long would it take for the flames to reach the top of a specimen that was twice as wide as the sample?




QUESTION 9
1. If an illuminated exit sign emitted light at 200 Lux within a room filled with smoke at an optical density of 2 db/m, at what lighting level a person would see the illuminated exit sign?




QUESTION 10
1. An old gas heater in a bathroom has developed a leak such that it is leaking gas (assumed to be Methane) at the rate of 0.15 kg every day. Assume that the pilot flame of the heater is still burning and that the mixture in the room is well mixed. If the bathroom is well sealed and
2. has dimensions of 3.5 m x 3 m x 2.4 m (length, width and height), how long would it take for ignition or explosion to occur?