FSS-204 Chapter 1

The effect of convection is directly influenced by the size and shape of the:

fire compartment.

______ fires involve energized electrical equipment, so the choice of extinguishing agents must be appropriate to minimize potential danger to those involved in fighting the fire.

Class C

Which class of fire involves combustible metals and dusts that are generally extinguished using a dry powder extinguishing agent?

Class D

Which type of fire involves cooking appliances using combustible vegetable or animal oils and fats?

Class K

_________ is a chemical reaction in which a combustible material and an oxidizing agent produce heat or energy, and other products that promote a self-sustaining process.

Combustion

Of the different methods of heat transfer, which is the transfer of heat from one body of material to another by direct contact?

Conduction

Which of the following forms of heat transfer occurs from one body to another through a medium such as a liquid or gas?

Convection

This type of fire is the most recognizable, can be seen by lighting a match, and requires the presence of a combustible gas because the visible flame is a gaseous reaction.

Diffusion flame

In this transition stage, the temperature in a room or space reaches a point at which all of the surfaces of the room or space simultaneously ignite, immediately leading to full room involvement.

Flashover stage

Which commonly used suppression agent can cover leaking fuel so that oxygen cannot reach the fuel?

Foam

What type of material is generally the best for heat transfer through conduction, because it absorbs and transmits heat rapidly and evenly?

Heavy, dense material

Which type of material produces twice the amount of heat per pound than common combustibles?

Plastic

________ is the form of heat transfer that occurs through electromagnetic energy. One example of this process is the sun heating the earth through millions of miles of space.

Radiation

What factor has a significant impact on fire growth, in addition to the shape of surrounding walls, ceilings, and roofs?

Size of a structure

Which type of fire, usually seen with charcoal briquettes and burning cigarettes, has no flame but still generates significant heat?

Smoldering

This type of fire starts without a known external heat source being applied to the combustible material.

Spontaneous combustion

Which of the following is a geometric depiction, developed through ongoing research, showing how fire is sustained by a chain reaction?

The fire tetrahedron

What has served as a teaching tool to geometrically depict the relationship between fuel, air, and heat?

The fire triangle

_______ is the most effective suppression agent for Class A fires because it has the ability to absorb the heat and reduce the temperature below the material's ignition temperature.

Water

The design of water-based fire extinguishing systems is based on the premise that one gallon of water, when properly applied, can absorb how many British thermal units?

8000