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Fire behavior practice questions

25 questions from the firefighter and fire alarm basics practice test.

Fire behavior practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

Class K extinguishers and agents are intended for fires involving

  1. Combustible metals such as magnesium
  2. Energized electrical switchgear
  3. Gasoline and other fuel spills
  4. Cooking oils and fats in kitchens
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D. Cooking oils and fats in kitchens

Class K is cooking media: vegetable and animal oils and fats in commercial cooking appliances. Gasoline is a Class B fuel; hot cooking oil gets its own class because it re-ignites easily and needs a saponifying wet agent.

Reference: Firefighter I: classification of fires

Burning magnesium shavings in a machine shop are which class of fire?

  1. Class A
  2. Class B
  3. Class C
  4. Class D
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D. Class D

Class D is combustible metals such as magnesium, titanium and sodium, which need special dry powder agents. They are solids, but they are not Class A: water can react violently with burning metal.

Reference: Firefighter I: classification of fires

A fire in an energized electrical panel is Class C. Once the power is confirmed off, the fire is treated as

  1. Class A or B, depending on what is burning
  2. Class C until the equipment is fully cool
  3. Class D, because metal parts are involved
  4. Class K, because insulation melts like oil
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A. Class A or B, depending on what is burning

Class C describes the shock hazard, not the fuel. With the power off, what is left is burning insulation, plastic or oil, so it is fought as Class A or B. It does not stay Class C just because the equipment is still hot.

Reference: Firefighter I: classification of fires

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