ISFTA CO Ch. 9

Question 1

Rapid fire growth usually occurs during which stage of fire development?

Answer 1

growth

Question 2

Understanding fire dynamics is ….

Answer 2

understanding everything that can happen during the growth stage

Question 3

T/F: If the fire enters a vent-limited decay phase it is in its final stage of development.

Answer 3

False

Question 4

the area where sufficient air is available to feed the fire

Answer 4

combustion zone

Question 5

A fire is in it’s growth stage until …

Answer 5

it has reached its peak heat release rate due to lack of fuel or oxygen

Question 6

When a fire cannot grow without the introduction of new oxygen or fuel , it has left the (blank) phase and become (blank).

Answer 6

growth; fully developed

Question 7

What are the two common routes to full development?

Answer 7

fire consumes all available oxygen and transitions to a state of ventilation-limited decay
The fire has enough oxygen to move through there growth phase and possibly through rapid fire development

Question 8

The tendency of gases to form into layers according to temp, density and pressure

Answer 8

thermal layering

Question 9

What can significantly alter thermal layering?

Answer 9

flow path / ventilation

Question 10

The space between the air intake and the exhaust outlet

Answer 10

flow path

Question 11

What causes the hot gas layer to spread downward within a compartment and laterally?

Answer 11

high pressure

Question 12

(blank) can move through the hot gas layer.

Answer 12

Isolated (intermittent) flames

Question 13

what is the net pressure of the neutral plane?

Answer 13

zero

Question 14

what is a ceiling jet?

Answer 14

Hot fire gases and fuel rich smoke spread across the ceiling horizontally

Question 15

Most residential fires that develop beyond the incipient stage become (blank)

Answer 15

vent limited

Question 16

As efficiency of combustion decreases, (blank) decreases and the amount of unburned fuel within the hot gas layer increases.

Answer 16

heat release rate

Question 17

refers to the rapid transition from the growth stage or early decay stage to a (blank)

Answer 17

Rapid fire development; ventilation limited, fully developed

Question 18

(blank) are also incidents off rapid fire development, but they involve more than just one compartment of a structure

Answer 18

Smoke explosions

Question 19

Four common element of a flashover:

Answer 19

Transition in F/D
Rapidity
Compartment
Pyrolysis

Question 20

What two factors determine the likelihood of flashover occurring?

Answer 20

Sufficient fuel
Sufficient oxygen

Question 21

High neutral place

Answer 21

early stages or F/d
high ceilings can hide well developed fires
fire above your level

Question 22

Mid-level neutral plane

Answer 22

compartment not yet ventilated or
flashover approaching

Question 23

very low-level neutral place

Answer 23

backdraft conditions
fire below you

Question 24

an increase in low level ventilation prior to upper level ventilation

Answer 24

backdraft conditions

Question 25

(blank) occurs in the decay stage, in a space containing high concentrations of heated flammable gases that lacks sufficient oxygen for flaming combustion

Answer 25

backdraft

Question 26

backdrafts can occur with the creation of a (blank) or (blank) opening

Answer 26

horizontal or vertical