Fire Science

Question 1

What is pyrolysis

Answer 1

The thermal decomposition of a substance by heat

Question 2

What is a passive agent

Answer 2

A passive is something that absorbs hear from fire

Question 3

What are the 2 limits of flammability

Answer 3

LEL:
The lower limit is defined as the lowest concentration of
fuel that will just support a self propagating flame

UEL:
The upper limit is defined as the highest concentration
of fuel that will just support a self propagating flame

Question 4

What is the ideal mixture

Answer 4

where the amount of gas is exactly right in relation to the amount of
oxygen in the air for combustion to occur with maximum force,

Question 5

Factors affecting fire development

Answer 5

Position of fire - (middle 4, wall 2, corner 1)
Ceiling height
Smoke layer (neutral plane) - under and over pressure
Ventilation.

Question 6

Phases of a fire

Answer 6

Early
Growth 
Flash over 
Fully developed 
Decaying

Question 7

Technique and purpose for direct cooling

Answer 7

Technique
The branch is open, a narrow jet aimed directly
at the seat of the fire.

Purpose
May be applied in the early and later stages of a
fire. Used directly on the seat of the fire.

Question 8

Types of extinguishing methods

Answer 8

Direct
Indirect
Gas cooling

Question 9

Describe the effective use of water

Answer 9

Small droplet size so give the maximum surface area to cool gases

Question 10

Types of gas cooling methods

Answer 10

Short pulse
Long pulse
Coning down