CFPS Fire Dynamics and Behavior 2

Question 1

What term describes the minimum temperature at which a liquid fuel produces enough vapor to ignite when an ignition source is present?

Accepted Answer

Flash point

Answer

Fire point

Answer

Autoignition temperature

Answer

Boiling point

Question 2

During flashover, the approximate temperature in the upper gas layer typically reaches:

Accepted Answer

900–1200°F (482–649°C)

Answer

200–300°F (93–149°C)

Answer

400–500°F (204–260°C)

Answer

1800–2000°F (982–1093°C)

Question 3

Which combustion product is the leading cause of fire fatalities in the United States?

Accepted Answer

Carbon monoxide

Answer

Carbon dioxide

Answer

Hydrogen cyanide

Answer

Acrolein

Question 4

The flammable (explosive) range of a gas is bounded by the:

Accepted Answer

Lower Flammable Limit (LFL) and Upper Flammable Limit (UFL)

Answer

Flash point and fire point

Answer

Autoignition temperature and piloted ignition temperature

Answer

Stoichiometric ratio and excess air coefficient

Question 5

A fuel package that is burning at the maximum rate limited by available oxygen rather than fuel surface area is said to be:

Accepted Answer

Ventilation-controlled

Answer

Fuel-controlled

Answer

Thermally thin

Answer

Stoichiometrically balanced

Question 6

The 'two-layer model' of compartment fire behavior refers to:

Accepted Answer

A hot upper gas layer and a cooler lower layer separated by a thermal interface

Answer

Solid fuel pyrolysis and vapor-phase combustion zones

Answer

Flame and smoldering combustion occurring simultaneously

Answer

Radiative and convective heat transfer acting on separate surfaces

Question 7

Backdraft is most likely to occur when a fire compartment has been:

Accepted Answer

Ventilation-controlled and then suddenly receives fresh air

Answer

Fuel-controlled throughout its entire development

Answer

Extinguished with water and allowed to cool for 30 minutes

Answer

Over-ventilated and all available fuel has been consumed