NFPA 921 LATEST EXAMS TEST PAPER
QUESTIONS AND ANSWERS SURE A+
✔✔3.3.37 Competent Ignition Source. - ✔✔An ignition source that has sufficient energy
and is capable of transferring that energy to the fuel long enough to raise the fuel to its
ignition temperature.
✔✔3.3.38 Conduction. - ✔✔Heat transfer to another body or within a
body by direct contact.
✔✔3.3.39 Convection. - ✔✔Heat transfer by circulation within a medium such as a gas
or a liquid.
✔✔3.3.40 Creep. - ✔✔The tendency of a material to move or deform
permanently to relieve stresses.
✔✔3.3.41 Current. - ✔✔A flow of electric charge.
✔✔3.3.42 Deductive Reasoning. - ✔✔The process by which conclusions are drawn by
logical inference from given premises.
✔✔3.3.43 Deflagration. - ✔✔Propagation of a combustion zone at a
velocity that is less than the speed of sound in the unreacted
, medium. [68, 2013]
✔✔3.3.44 Density. - ✔✔The mass of a substance per unit volume,
usually specified at standard temperature and pressure. The density of water is
approximately one gram per cubic centimeter. The density of air is approximately 1.275
grams per cubic meter.
✔✔3.3.45 Detection. - ✔✔(1) Sensing the existence of a fire, especially
by a detector from one or more products of the fire, such as smoke, heat, infrared
radiation, and the like. (2) The act or process of discovering and locating a fire.
✔✔3.3.46 Detonation. - ✔✔Propagation of a combustion zone at a
velocity greater than the speed of sound in the unreacted medium. [68, 2013
✔✔3.3.47 Diffuse Fuel. - ✔✔A gas, vapor, dust, particulate, aerosol,
mist, fog, or hybrid mixture of these, suspended in the atmosphere, which is capable of
being ignited and propagating a flame front.
✔✔3.3.48 Diffusion Flame. - ✔✔A flame in which fuel and air mix or diffuse together at
the region of combustion.
✔✔3.3.49 Drop Down. - ✔✔The spread of fire by the dropping or falling
of burning materials. Synonymous with "fall down."
✔✔3.3.50 Effective Fire Temperatures. - ✔✔Temperatures reached in fires that produce
physical effects that can be related to specific
temperature ranges.
✔✔3.3.51 Electric Spark. - ✔✔A small, incandescent particle created
by some arcs.
✔✔3.3.52* Empirical Data. - ✔✔Factual data that is based on actual
measurement, observation or direct sensory experience rather than on theory.
✔✔3.3.53 Energy. - ✔✔A property of matter manifested as an ability to
perform work, either by moving an object against a force or by transferring heat.
✔✔3.3.54 Entrainment. - ✔✔The process of air or gases being drawn
into a fire, plume, or jet.
✔✔3.3.55 Explosible. - ✔✔A material with a pressure ratio (maximum
pressure/pressure at ignition, in absolute units) equal to or greater than 2.0 in any test
when tested using the explosibility or Go/No-Go screening test described in Section 13
of ASTM E1226, Standard Test Method for Explosibility of Dust Clouds.
QUESTIONS AND ANSWERS SURE A+
✔✔3.3.37 Competent Ignition Source. - ✔✔An ignition source that has sufficient energy
and is capable of transferring that energy to the fuel long enough to raise the fuel to its
ignition temperature.
✔✔3.3.38 Conduction. - ✔✔Heat transfer to another body or within a
body by direct contact.
✔✔3.3.39 Convection. - ✔✔Heat transfer by circulation within a medium such as a gas
or a liquid.
✔✔3.3.40 Creep. - ✔✔The tendency of a material to move or deform
permanently to relieve stresses.
✔✔3.3.41 Current. - ✔✔A flow of electric charge.
✔✔3.3.42 Deductive Reasoning. - ✔✔The process by which conclusions are drawn by
logical inference from given premises.
✔✔3.3.43 Deflagration. - ✔✔Propagation of a combustion zone at a
velocity that is less than the speed of sound in the unreacted
, medium. [68, 2013]
✔✔3.3.44 Density. - ✔✔The mass of a substance per unit volume,
usually specified at standard temperature and pressure. The density of water is
approximately one gram per cubic centimeter. The density of air is approximately 1.275
grams per cubic meter.
✔✔3.3.45 Detection. - ✔✔(1) Sensing the existence of a fire, especially
by a detector from one or more products of the fire, such as smoke, heat, infrared
radiation, and the like. (2) The act or process of discovering and locating a fire.
✔✔3.3.46 Detonation. - ✔✔Propagation of a combustion zone at a
velocity greater than the speed of sound in the unreacted medium. [68, 2013
✔✔3.3.47 Diffuse Fuel. - ✔✔A gas, vapor, dust, particulate, aerosol,
mist, fog, or hybrid mixture of these, suspended in the atmosphere, which is capable of
being ignited and propagating a flame front.
✔✔3.3.48 Diffusion Flame. - ✔✔A flame in which fuel and air mix or diffuse together at
the region of combustion.
✔✔3.3.49 Drop Down. - ✔✔The spread of fire by the dropping or falling
of burning materials. Synonymous with "fall down."
✔✔3.3.50 Effective Fire Temperatures. - ✔✔Temperatures reached in fires that produce
physical effects that can be related to specific
temperature ranges.
✔✔3.3.51 Electric Spark. - ✔✔A small, incandescent particle created
by some arcs.
✔✔3.3.52* Empirical Data. - ✔✔Factual data that is based on actual
measurement, observation or direct sensory experience rather than on theory.
✔✔3.3.53 Energy. - ✔✔A property of matter manifested as an ability to
perform work, either by moving an object against a force or by transferring heat.
✔✔3.3.54 Entrainment. - ✔✔The process of air or gases being drawn
into a fire, plume, or jet.
✔✔3.3.55 Explosible. - ✔✔A material with a pressure ratio (maximum
pressure/pressure at ignition, in absolute units) equal to or greater than 2.0 in any test
when tested using the explosibility or Go/No-Go screening test described in Section 13
of ASTM E1226, Standard Test Method for Explosibility of Dust Clouds.
