Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

FDNY Manual 10/28/24 > Fire Dynamics > Flashcards

Fire Dynamics Flashcards

TB Fire Dynamics Chapter 1 - 4

1
Q

What are the four parts of the Fire Tetrahedron?

A

Heat
Oxygen
Fuel
An uninhibited chemical chain reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

If one part of the fire tetrahedron is missing can flaming combustion still take place?

A

No, all four are needed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What state of matter burns?

A

Gasses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The conversion of solid into a gas is called?

A

Pyrolysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The conversion of liquid into a gas is called?

A

Vaporization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

T or F? Surface to Mass ratio affects the ease of ignition of liquid fuels?

A

False
Surface to Mass Ratio affects solid fuel.
Surface to Volume Ratio affects liquid fuels.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What color smoke indicates a wood structure is burning?

A

Brown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Oxygen in the air is normally?

A

20.8%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Fire can ignite and burn till what percentage of oxygen?

A

15 %, lower and it shall enter non-flaming mode.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which fuels do not require oxygen in the air to burn

A

Chemical oxidizers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

T or F? In oxygen rich environments, many materials that do not burn at all in normal environments will burn.

A

True.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the law of heat flow?

A

Heat always flows from a hot substance to a cold substance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How does heat spread via conduction

A

direct contact of two objects or by an intervening heat-conducting medium.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How does heat spread via convection

A

By air or liquid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Which is the most common way fire spreads through walls, up stairwells or elevator shafts

A

Convection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

T or F? Forced convection is a critical factor in wind driven fires?

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How does heat spread via Radiation?

A

Through the movement of heat waves until it reaches an object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are the four methods for extinguishment theory?

A

Heat Reduction
Fuel Removal
Oxygen Removal
Flame inhibition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Application of water is which of the extinguishment theory?

A

Heat Reduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the three methods of fuel removal?

A

Stopping the flow of liquid or gaseous fuels
Removing solid fuel from the path of the fire.
Allow the fire to burn until the fuel is consumed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Flooding an area with inert gas that displaces the oxygen is which part of extinguishment theory

A

Oxygen Removal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Extinguishment by Chemical Flame Inhibition is effective on what types of fuel?

A

gas and liquid fuels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Which Class is a Green Triangle

A

Class A: Common Combustibles

24
Q

What Class is a Red Square

A

Class B: Flammable Liquids and Gases

25
Q

What Class is a Blue Circle

A

Class C: Electrical

26
Q

What Class is a Yellow Star

A

Class D: Combustible Materials

27
Q

What Class is a Black Hexagon

A

Class K: Cooking oils and Fats

28
Q

Flash Point is?

A

The lowest temperature of a liquid that gives off sufficient vapors to ignite but will not continue to burn.

29
Q

T or F? Flammable Liquid is a liquid that has a flash point equal to or greater than 100 ‘ F

A

False.
Flammable Liquid is a liquid that has a flash point below 100’ F
Combustible Liquid has a flash point equal to or greater than 100’ F

30
Q

What is a fire point?

A

The Lowest temperature at which a liquid will ignite and achieve sustained burning.

31
Q

Will a gas with a vapor density greater than 1 sink or rise in a compartment?

A

Sink

32
Q

Can a gaseous fuel concentration higher than the upper explosive limit ignite?

A

No

33
Q

T or F? The Growth Stage is the earliest stage of a fire?

A

False, Incipient Stage

34
Q

What is not a Characteristic of a Backdraft?

A)
B) Free Burning Fire
C)
D)

A
35
Q

During the incipient stage, has the temperature in the room dramatically increased?

A

No, only slightly

36
Q

What stage does rollover and flashover occur?

A

Growth Stage

37
Q

What stage of the fire can be extinguished by a proper fire extinguisher?

A

Incipient Stage

38
Q

When does a fully developed stage occur?

A

After a flashover

39
Q

T or F? The fully developed stage can occur at the same time as the growth stage?

A

True, the fire is only fully developed within the compartment that has flashed over. Other compartments or rooms may be in the growth stage

40
Q

At what point does a fire enter the decay stage?

A

When all the available fuel is consumed or when the oxygen concentration falls below 15 % and flaming combustion is diminished

41
Q

What is the far more dangerous type of way a fire enters the decay stage: Fuel limited or Ventilation limited?

A

Ventilation limited. A Vent limited fire can rapidly restart if improperly introduced to oxygen.

42
Q

The hottest gases tend to be where in thermal layering

A

At the top.

43
Q

What are the two categories of thermal layering

A

Upper Layer and Lower Layer

44
Q

The vertical distance from the floor of the enclosure to the thermal interface is called?

A

Interface height

45
Q

The five characteristics of smoke to be sized up?

A

Volume
Velocity
Density
Color
Stratification

46
Q

Of the two types of smoke flow, laminar or turbulent, which indicates some distance between you and the fire?

A

Laminar Smoke

47
Q

T or F? Dense smoke can indicate the fire is a vent limited fire?

A

True

48
Q

Black smoke indicates what?

A

Fuel-rich conditions and restricted air supply.

49
Q

What does Grey smoke indicate?

A

That you are remote from the fire as it has lost its carbon.

50
Q

What does White Smoke Indicate

A

1) Water is on fire and progress is being made on the fire.
2) Heat has continued to increase and there is insufficient oxygen even for smoldering.

51
Q

A neutral plane that is at or near floor level may indicate?

A

The fire is on a floor below

52
Q

A sudden rise in the interface height indicates?

A

Ventilation has occurred.

53
Q

What is it when Unburned fire gases that have accumulated at the roof ignite and flames travel through the hot gas layer across the ceiling?

A

rollover

54
Q

A Flashover is?

A

The simultaneous ignition of all the combustible materials in a compartment.

55
Q
A

FDNY Manual 10/28/24 (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions