FCTC Fire Behavior and Service Terminology 4

Question 1

What term describes the minimum temperature at which a liquid produces enough vapor to form an ignitable mixture near its surface?

Accepted Answer

Flash point

Answer

Flash point is the lowest temperature at which a liquid gives off sufficient vapor to form an ignitable mixture with air near the surface.

Question 2

Which phenomenon occurs when a fire in a compartment suddenly and simultaneously ignites all exposed combustible surfaces?

Accepted Answer

Flashover

Answer

Flashover is the near-simultaneous ignition of all combustible materials in an enclosed area when they reach their ignition temperature.

Question 3

In fire service terminology, what does the acronym 'BLEVE' stand for?

Accepted Answer

Boiling Liquid Expanding Vapor Explosion

Answer

BLEVE stands for Boiling Liquid Expanding Vapor Explosion, which occurs when a pressurized container holding liquid fails catastrophically.

Question 4

What is the term for the layer of hot gases and smoke that accumulates at the ceiling level of a burning room?

Accepted Answer

Smoke layer

Answer

The smoke layer or hot gas layer forms at ceiling level as buoyant combustion products rise and collect, creating a stratified zone.

Question 5

Which class of fire involves energized electrical equipment?

Accepted Answer

Class C

Answer

Class C fires involve energized electrical equipment, and water-based extinguishers should not be used due to electrocution risk.

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