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Exam CFPS topic 1 question 7 discussion

Actual exam question from NFPA's CFPS
Question #: 7
Topic #: 1
[All CFPS Questions]

The entrainment of air from the surrounding atmosphere in a rising fire plume has the effect of:

  • A. decreasing the total mass/volume of the plume, cooling the plume, concentrating the fire products.
  • B. increasing the total mass/volume of the plume, heating the plume, reducing the concentration of fire products.
  • C. decreasing the total mass/volume of the plume, heating the plume diluting the concentration of fire products.
  • D. increasing the total mass/volume of the plume, cooling the plume, diluting the concentration of fire products.
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Suggested Answer: D 🗳️

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KhalidAwan1
1 month, 1 week ago
The turbulent flow at the interface between the hot (buoyant) fire plume and the surrounding cold air creates vortices which entrain fresh air into the plume, controlling the diffusion flame combustion characteristic scales and oscillations.
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