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Question

Difficulty: EasyFires and Fire Extinguisher Use

Which fuel source corresponds to each fire classification? Match each commercial vehicle fire class to its correct burning material.

  • Class A FireWood, paper, cloth, and ordinary combustibles
  • Class B FireFlammable liquids, diesel fuel, oil, and grease
  • Class C FireEnergized electrical equipment, wiring, and fuse panels
  • Class D FireCombustible metals such as magnesium

Answer

Class A matches ordinary combustibles (wood, paper, cloth); Class B matches flammable liquids (diesel, oil, grease); Class C matches energized electrical equipment; Class D matches combustible metals.
Standard commercial vehicle fire safety defines Class A for ordinary combustibles (wood, cloth, paper), Class B for flammable liquids and gases (fuel, grease), Class C for energized electrical equipment, and Class D for combustible metals.

Step-by-Step Solution

1
Identify the standard fire classifications recognized in commercial driving safety.
Recognize that classifications A, B, C, and D categorize fires according to the physical properties and hazards of their fuel sources.
Using the wrong extinguishing agent on a specific fire class can accelerate the fire or cause fatal injuries such as electric shock.
2
Pair each fire class designation with its corresponding fuel source.
Class A is paired with ordinary combustibles, Class B with flammable liquids, Class C with live electrical equipment, and Class D with combustible metals.
Correct matching ensures the driver selects an extinguisher rated for the specific hazard present.

Key Concept

Fire extinguisher classifications (A, B, C, D) and their associated fuel sources
Estimated Time:45s
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Topics

Fires and Fire Extinguisher Use

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