NFPA 921 (CHAPTER 5)
Conduction heat transfer..... - correct answer-Takes place within solids when one portion of
an object is heated
Convection heat transfer - correct answer-Transfer of heat energy by the movement of
heated liquids or gases from the source of heat to a cooler part of the environment.
Define class A fires? - correct answer-Ordinary Combustibles
Example: wood, paper, cloth, plastics, rubber products
Define class B fires - correct answer-Flammable or combustible liquids
Define class C fires - correct answer-Energized Electrical equipment. Example: Circuit
breakers, Computers, electric appliances, as long as the are energized.
Define class D fires - correct answer-Combustible Metals. Example: Magnesium and zinc
are most common. Found commonly in automobiles.
Define class K fires - correct answer-Fires involving cooking oils and greases such as
animals and vegetable fats
Define fire plumes - correct answer-The primary engine for flows is the creation of hot gases
by the fire itself.
Define Fuel item - correct answer-Any article that is capable of burning.
Define Fuel load - correct answer-The amount fuel present, usually within a compartment. It
is commonly expressed in terms of wood-fuel or the potential combustion energy.
Define fuel package - correct answer-collection or array of fuel items in close proximity to
one another such that the flames can spread throughout the array.
Define heat flux - correct answer-The amount of power per unit area.
Define power - correct answer-Property that describes energy released per unit time.
Define Thermometry - correct answer-The study of the science, methodology, and practice
of temperature measurement.
Empirical Temperature Scale - correct answer-Fahrenheit and Celsius
Flammable gases can only be ignited by...... - correct answer-A spark or pilot flame over
specific ranges of gas concentration.
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