Candidate Physical Ability Test (CPAT) Practice Test

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What happens during the flashover stage of a fire?

Oxygen level increases dangerously
Combustible contents of a compartment are totally in flame
Only the floor is burning
The fire begins to die down

The correct answer is: Combustible contents of a compartment are totally in flame

During the flashover stage of a fire, the term refers to a rapid transition where the fire spreads extremely quickly, resulting in the combustible contents within a compartment becoming fully engulfed in flames. This phenomenon occurs when the temperature within the room reaches a point where all combustible materials ignite almost simultaneously, leading to a significant increase in the intensity and spread of the fire. This stage is critical because it marks a shift in the dynamics of the fire. Prior to flashover, there might have been localized areas burning, but once flashover occurs, the entire room or space can become filled with flames. This rapid combustion is driven by the accumulation of heat and gases, making it a pivotal moment where fire behavior changes dramatically. Understanding this stage is essential for firefighting efforts and safety, as it signifies a moment when the fire poses an extreme danger to both occupants and responders due to the sudden increase in heat and the potential for rapid loss of visibility and structural integrity.