Chapter 3 / Topic 3 Practice Test

When the oxygen concentration is below __________ percent, flaming combustion will not usually be supported.

14-16

What factor(s) control or influence the occurrence of self-heating and self-ignition?

All the above.

At which stage(s) of structure fire will automatic sprinklers normally operate?

Ceiling layer development or pre-flashover stages

In the fire tetrahedron, which of the following is the reducing agent?

Fuel

When referring to the L.E.L. of a flammable or combustible liquid, what does L.E.L. mean?

Lower Explosive Limit

Heat can travel throughout a burning building by one or more of three methods commonly referred to as:

conduction, radiation, and convection

The upper and lower concentrations of a vapor that will produce a flame at a given pressure and temperature are called:

flammable and explosive limits

The four components of combustion characterized in the fire tetrahedron are:

fuel, heat, oxidizing agent, and uninhibited chemical chain reaction.

The colder of two bodies will always absorb heat until both objects are the same temperature is explained by the principle of:

heat transfer

The presence of a thick, oily soot on glass, including hydrocarbon residues, is positive proof of the presence of:

incomplete combustion

When determining fire spread in a structure, one of the most important factors to consider is:

ventilation openings

The main hazard of an oxidizer under fire conditions is its ability to:

yield oxygen to enhance combustion