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CDI 6 > Discussion 2 > Flashcards

Discussion 2 Flashcards

1
Q

Stages/Phases of fire

A
  1. Incipient/Ignition Phase
  2. Free-burning/Growth Phase
  3. Smouldering/Decay Phase
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2
Q
  • ignition describes the period when the four elements of fire tetrahedron come together and combustion begins
A

Incipient/Ignition Phase

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3
Q

When fuel and oxygen are present oou in the correct ratio, an initial source of heat are present causing ignition by any of the following Characteristics:

A

Characteristics:

Point at which fire starts
Ignition source available
Little heat and smoke
There are rising hot gases
Fire small and generally confined to the fuel first ignited

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4
Q

Fire has not yet influenced environment to significant extent

A

Incipient Stage

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5
Q

Temperature only slightly above ambient concentrations of products of combustion low

A

Incipient Stage

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6
Q
  • once a reaction between the fuel and oxygen has started, the combustion can be rapid. A gas explosion or dust explosion can develop in seconds.
A

Free-burning/Growth Phase

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7
Q

Characteristics of Free-burning/Growth Phase

A

Fire has involved more fuel
Oxygen supply is depleted
Heat accumulates at upper area
Area is fully involved

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8
Q

Temperatures are rapidly increasing

A

Growth Stage

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9
Q

Additional fuel package are become involved

A

Growth Stage

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10
Q

Fuel package or giving of combustible gases

A

Growth Stage

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11
Q

all contents within the perimiter of the fire are the bourdines are buinng

A

Fully develop phases

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12
Q

The final phase burning wherein flame ceases but dense smoke and heat completely fill the confined room.

A

Smouldering/ Decay Phase

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13
Q

It is all fuel consume in the fire diminished in the area

A

Smouldering/ Decay Phase

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14
Q

It is all fuel consume in the fire diminished in the area

A

Smouldering/ Decay Phase

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15
Q

It result fire dying after it has consumed all the fuel and the oxygen available

A

Smouldering/ Decay Phase

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16
Q

▸ Explosion that occurs when oxygen is suddenly admitted to a confined area that is very hot & filled with combustible vapors

A

Decay Stage - Backdraft

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17
Q

It is for begin to growth from the point of the ignition

A

Free burning/ growth phase

18
Q

The thermal layering of gases is the tendency of gases to form into layers according to temperature

A

THERMAL LAYERING OF GASES

19
Q

Other terms used to describe this tendency are hits stratification and thermal balance

A

THERMAL LAYERING OF GASES

20
Q

It is know disruptions of heat

A

THERMAL LAYERING OF GASES

21
Q

The hot gases tend to be in the top layer, while the cooler gases from the lower layer

A

THERMAL LAYERING OF GASES

22
Q

-Tendency of gases to form layers according to temperature.

A

THERMAL LAYERING

23
Q

-Hottest gases form top layers; cooler gases form bottom layers.

A

HEAT STRATIFICATION

24
Q
  • No disruption of heat,
A

THERMAL BALANCE

25
Q

They are not too hot or not too cold

A

THERMAL BALANCE

26
Q

A normal movement or behavior of fire when the fire is undisturbed.

A

THERMAL BALANCE

27
Q

Disruption of heat stratification (hot gases mix throughout the compartment

A

THERMAL IMBALANCE

28
Q

Abnormal movement of fire due to interference of the matter

A

THERMAL IMBALANCE

29
Q

An indication of the presence of unburned fuel vapours within a compartment with the potential for pre-mixing and a potential explosion

A

PULSATION CYCLE

30
Q

A smoke explosion caused by a sudden introduction of oxygen into a confined building of area.

A

BACKDRAFT/BACKDRAUGHT

31
Q

A smoke explosion caused by a sudden introduction of oxygen into a confined building of area.

A

BACKDRAFT/BACKDRAUGHT

32
Q

It is sudden explosions produced by the oxygen in favoring by the fire cycle

A

BACKDRAFT/BACKDRAUGHT

33
Q

The rate of heat production from a fore determines the effect on the adjacent equipment and structures.

A

FIRE INTENSITY

34
Q

With solids and liquids the fire can normally only burn on the surface.

A

FIRE INTENSITY

35
Q

The intensity should be kept at a lower level, accepting a longer duration of the fire

A

FIRE INTENSITY

36
Q

The heat released from a certain quantity of fuel is approximately double the amount of the heat released from an identical quantity of solid fuel

A

FIRE INTENSITY

37
Q

Some types of fuelds naturally burn hotter (more intensely) than others. For irpe, while an acetylene flame is hotter than a gasoline fire burns hotter than a wood example, a gasoline flame.

A

INTENSITY OF FIRE

38
Q

Factors to determine the Intensity of fire;

A
  1. Type of fuel
  2. Percentage of oxygen present
39
Q

Heat released from a fire passes to other areas or equipment either by means of convection, conduction, or radiation.

A

FIRE SPREAD

40
Q

It because when the heat travel through electromagnetic waves in air the fire can be spread

A

FIRE SPREAD

CDI 6 (8 decks)

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