CFPS Fire Dynamics and Behavior 4

Question 1

In a fully developed (post-flashover) compartment fire, the fire is typically characterized as:

Accepted Answer

Ventilation-controlled with excess unburned fuel

Answer

Post-flashover fires are generally ventilation-controlled, meaning oxygen supply limits combustion and unburned gases may exit through openings and burn externally.

Question 2

The 'equivalent fire resistance' method in structural fire protection is based on which fire concept?

Accepted Answer

Time-temperature curve comparison between a real fire and a standard fire

Answer

Equivalent fire resistance compares the thermal exposure of a real (parametric) fire with the standard ISO 834 or ASTM E119 time-temperature curve.

Question 3

What term describes the minimum concentration of a gas or vapor in air below which a flame will not propagate from an ignition source?

Accepted Answer

Lower Flammable Limit (LFL)

Answer

The Lower Flammable Limit (LFL) is the minimum fuel concentration in air below which the mixture is too lean to sustain flame propagation.

Question 4

Which parameter is used in Heskestad's flame height correlation to predict mean visible flame height?

Accepted Answer

Convective heat release rate and fire diameter

Answer

Heskestad's correlation uses the convective heat release rate (Q*) and fire source diameter to predict mean visible flame height above the base of the fire.

Question 5

A 'thermally thick' solid is one where:

Accepted Answer

Heat does not penetrate significantly into the interior during the relevant exposure period

Answer

A thermally thick material behaves as if it has infinite depth because the thermal wave does not reach the back face during the exposure time of interest.

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS Fire Dynamics and Behavior 4