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NFPA 921 (CHAPTER 5) Questions & Answers $11.49   Add to cart

Exam (elaborations)

NFPA 921 (CHAPTER 5) Questions & Answers

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  • NFPA 921
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  • NFPA 921

What is energy? - ANSWERSAbility to perform work, either by moving over a distance against a force or by transferring heat. How is energy measured - ANSWERSJoules, calories, or BTU's Define power - ANSWERSProperty that describes energy released per unit time. How is power measured? - ANSWE...

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  • October 26, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • NFPA 921
  • NFPA 921
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NFPA 921 (CHAPTER 5) Questions &
Answers
What is energy? - ANSWERSAbility to perform work, either by moving over a distance
against a force or by transferring heat.

How is energy measured - ANSWERSJoules, calories, or BTU's

Define power - ANSWERSProperty that describes energy released per unit time.

How is power measured? - ANSWERSJoules per second or watts.

Define heat flux - ANSWERSThe amount of power per unit area.

What are the 4 components of the Fire Tetrahedron - ANSWERS1. Fuel 2. Heat 3.
Oxidizing agent 4. Chemical chain reaction.

What is fuel - ANSWERSAny substance that can undergo combustion.

What is the Oxidizing agent - ANSWERSOxygen in the earths's atmosphere

What is fire chemistry - ANSWERSStudy of chemical processes that occur in fires,
including changes of state, decomposition, and combustion.

define combustion - ANSWERSFuel and Oxidizing agent mixed (premixed burning)

What is LEL - ANSWERSLower explosives limit--minimum % of fuel in air in which
combustion can occur.

what is UEL - ANSWERSUpper explosive limit--maximum % of fuel in air in which
combustion can occur.

The difference between the lower and upper limits is called - ANSWERSFlammable or
explosive range.

Define fire plumes - ANSWERSThe primary engine for flows is the creation of hot gases
by the fire itself.

Name the 3 mechanisms of heat transfer - ANSWERSConduction, convection, and
radiation.

Conduction heat transfer..... - ANSWERSTakes place within solids when one portion of
an object is heated

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