STCW Firefighting Latest Exams and Solutions

STCW Firefighting Latest Exams and Solutions number one cause of fire - Answer - -careless smoking habits (disposal, smoking in bed, disregard for restricted area) -poor housekeeping(dirty/oily machinery, clothes drier lint) heat, oxygen, and fuel - Answer - _______,________, and___________ are sides of the fire triangle fire triangle - Answer - heat, oxygen, and fuel are sides of the___________ removal of any 1 component - Answer - will cause the fire to be extinguished the fire tetrahedron - Answer - ____________________, or all components are necessary for a fire to occur tetrahedron - Answer - the fire triangle required temperature - Answer - anything that produces the __________ _____________ for ignition will satisfy this leg of the triangle - sun, open flame, chemical reaction, sparks, friction, static electricity, biological processes 21% oxygen - Answer - earths atmosphere vapors - Answer - only ________ burn liquids and solids - Answer - are too dense/must be vaporized 1st burn - Answer - the tendency of a substance to vaporize is an indication of its ability to ______ solids - Answer - -liquids vaporize more readily than __________ gases - Answer - _________ are already in a vapor state oxygen-heat-fuel - Answer - you can have ________-________-___________ in the same place and still not have a fire fuel-oxygen - Answer - _______-________ relationship must be balanced, i.e., must be in the flammable range ignition temperature - Answer - heat must be sufficient to bring fuel to its -remove fuel, or -remove heat, or -remove oxygen, or -interrupt chemical reaction, or -do any combination above - Answer - To stop a fire Class A - Answer - combustile solids (trashcan, paper,wood) Class B - Answer - combustile; flammable liquids Class C - Answer - energized electrical equipment (wiring) Class D - Answer - combustile metals (Aluminum, Magnesium) Class K - Answer - cooking material (cooking oils) flash point of a liquid - Answer - -the lowest temp. at which a liquid gives off sufficient vapor to form an ignitable mixture at the surface of the liquid -fire flashes across the surface given sufficient oxygen and external source of ignition -lowest temp. at which we can have a fire -indicator of the severity of a fire hazard fire point - Answer - just above the flash point- liquid vaporizes rapidly enough to sustain continuous combustion ignition temperature - Answer - lowest temp. of a combustible substance at which sustained combustion will occur without spark or flame spontaneous combustion - Answer - heat is generated by a chemical action within a substance and this continues until you have ignition -begins with oxidation and combines with oxygen and gives off energy in the form of heat lower flammable limit - Answer - the least concentration of flammable vapors in the air that will burn (lean limit) upper flammable limit - Answer - the greatest concentration of flammable vapors in air that will burn(rich limit) smoke, flame, heat, and gases - Answer - results of combustion smoke - Answer - is the result of incomplete combustion free burning - Answer - white or light gray smoke hot fire, lack of oxygen - Answer - black or dark gray smoke flame - Answer - produced as a result of the conversions of the fuel to a state of blazing combustion heat - Answer - generated thru the rapid oxidation of the material gases - Answer - produced as a result of combustion; may or may not be toxic, assume they are toxic