Teorifrågor kap 1-6 Branddynamik 1: Suprise test 7/10 Flashcards
The adsence of smoke in a candle is a indication of…
Efficient combustion
In early stage of room fire, the room has negligible effect on the fire. At this point the fire is called…
Fuel controlled fire
What phenomenon causes plume to rise up…
Buoyancy, due to mass loss
Flasover causes sudden increases in…
Energy release rate
Fully developed fire occurs after flashover or backdraft
Both after backdraft and flashover
What cause pyrolysis in a room fire
Lack of both ventilation and O2
Descend of hot layer towards fire
Correctly match all the points with events on a room fire in the figure
(see paper)
A. Flashover
B. Fully developed
C. Backdraft
D. O2 cut off/ oxygen dependent
What is the correct sequence of events in a room fire?
ignition -> Growth -> Flashover -> Fully developed -> Decay
Under what conditions a fire can have a long growth period?
O2 deplotion
Pyrolysis
Small room with no opening
(See paper) When does flashover usally occurs
Between C and D
Why will a porous plastic burn more rapidly then a solid plastic of the same dimensions?
Due to high surface area
Explain what happening based on following image:
Slower flame spread due to combustible ceiling
A fire is burninf in the following room having high ceiling but small floor, what will happend?
Less feedback from ceiling - direct radiation from flame might ignite secondary fuels = more air entrained in th eplume = more smoke
What would be you ideal room that will have most fire safe scenerio?
Large floor and high ceiling
The proportional aspect of ventilation factor to mass loss rate in example high ventilation factor causes high mass loss rate is not valid in which stage of room fire?
Decay stage
