Fire quiz Flashcards
4 components of fire tetrahedron
fuel, heat, oxygen, chemical reaction
define flashpoint
the lowest temperature that a combustible liquid or solid will give off sufficent vapours to ignite momentarily when a heat source is applied
define ignition temperature
the minimum temperature that a substance must be heated to in the presence of oxygen in order to cause continuous, self-sustained combustion independent of an external heat source
4 methods of heat transfer
conduction, convection, radiation, direct flame contact
four main classes of fire
class a: solid fuel- wood, cardboard, paper
class b: flammable liquids- gasoline, paints, solvents
class c: charged electrical- short circuits, overloaded circuits
class d: metal fuels- magnesium, titanium, potassium
class k: combustible cooking vegetables
4 methods of extinguishing fire
heat removal (cooling), oxygen removal (smothering), remvoal of fuel, flame interuption
which first aid extinguisher used to fight “a” fire
pressurized air-water
which classes of fire would you attack with dry chemical powder extingusher
B & C
method of extinguishment does a co2 employ
oxygen displacement/smothering
what percentage setting for inline euductor
3%
fitted system provides the most effective means of protecting compartments where explosives are stored
water flood & spray system
duties of fire sentry
prevent re-flash
preserve evidence
restrict access to space
procedures for establishing fire boundary
- rig, charge and test hose
- check for heat using back of hand
- apply cooling spray
- inform ood when set
- remove flammable material
- complete total confinement
- hose remains outside the space for electrical spaces
warning whistle psi of drager gear
1200 psi
operating duration of EEBD
15 mins
purpose of twin agent unit
self contained system only used for helo crash rescue, AFFF & potassium bicarbonate
5 items to include in report to RRT by discoverer of fire
types/class of fire
location of fire in the space
size of fire
casualties seen in space
actions taken
3 sources of heat energy
chemical- from chemical reaction
mechanical- from friction & compression
electrical- from overloaded/damaged or degraded cables
co2 extinguisher
“c” & small “b”
expells co2 under pressure
k guard
“a” & “k”
nitrogen
potassium acetate
air water
“a”
air
water
dry chemical
“b” & “c”
nitrogen
potassium bicarbonate
how does AFFF extinguish a fire
forms a thin film on the surface of fuel & prevents vapours from reigniting
from what fitted system does the ramfan 2000 get its power from
fire main through charged hose
