TB 90 - Fire Burns

Question 1

Aggressive what is the trademark of the LAFD?

Answer 1

Interior firefighting

Question 2

One of the greatest risks firefighters encounter during firefighting operations is what?

Answer 2

Thermal burns

Question 3

Thermal burns can occur by what type of heat sources?

Answer 3

Contact with conducted heat
Exposure to convective heat
Exposure to radiant heat or direct flame impingement

Question 4

Steam can cause full thickness burns to unprotected skin with less than how many seconds of exposure?

Answer 4

3 seconds

Question 5

Tests indicate that exposure to temperatures of only what degree will cause extreme pain and sever full thickness burns to all unprotected skin?

Answer 5

280-320 degrees

Question 6

Second degree burns can occur with exposure to only what degree?

Answer 6

111 degree

Question 7

Second degree burns can occur within how many seconds of exposure to 131 degree?

Answer 7

20 seconds

Question 8

Second degree burns can occur within how many seconds of exposure to 158 degrees?

Answer 8

1 second

Question 9

Steam burns develop faster and are more severe than dry heat burns at the same temperature due to what transfer?

Answer 9

Latent heat transfer

Question 10

Which type of exposure is the most severe?

Answer 10

Direct flame impingement

Question 11

A firefighter caught in a flashover just 5 feet inside a room will be exposed to temperatures of what degree?

Answer 11

1,000 to 1,500 degrees

Question 12

A firefighter caught in a flashover just 5 feet in a room will be exposed to direct flame impingement for at least how many seconds?

Answer 12

2 seconds

Question 13

The 6 observable or measurable factors in a Class A Fire are?

Answer 13

Input heat
Fuel
Oxygen 
Proportioning of fuel/air mixture
Mixing of fuel air/mixture
Uninhibited chain reactions between fuel/air mixture

Question 14

What are some of the products of combustion that will be present in all fires?

Answer 14

Toxic/flammable vapors or gases
Carbon based particulate matter
Non toxic and/or flammable vapors or gases
Free radicals
Heat

Question 15

What is a form of energy in transit or change?

Answer 15

Heat

Question 16

A what is the amount of heat required to raise temperature of 1 pound of water 1 degree?

Answer 16

BTU

Question 17

What is the quantity of heat absorbed by a substance when passing between 2 phases such as solid to liquid or liquid to vapor?

Answer 17

Latent of heat

Question 18

Water has a latent heat of cushion of how many BTUs?

Answer 18

143

Question 19

Water has a latent heat of vaporization of how many BTUs?

Answer 19

970

Question 20

Products of combustion are carried vertically and horizontally known as what to remote areas of the structure?

Answer 20

Mushrooming

Question 21

What 3 stages of in the development of an interior fire are there?

Answer 21

Growth stage
Fully developed stage
Decay stage

Question 22

What can be identified as the curve occurring near the end of the growth stage?

Answer 22

Flashover

Question 23

What is the sudden full room or area involvement in flame or auto ignition of combustible surface heated by convection and or radiation resulting in a sudden and intense rise in temperature?

Answer 23

Flashover

Question 24

What is one the major causes of fire ground fatalities and the most dangerous stage of fire development?

Answer 24

Flashover

Question 25

Synthetic furnishings that when ignited burn how many times hotter than ordinary combustibles making the temperature curve look more like a spike?

Answer 25

2 to 3 times

Question 26

What is a sudden sporadic generation of flame mixed smoke at the upper ceiling level just before flash over and is the last warning to withdraw from the area?

Answer 26

Roll over

Question 27

What usually occurs after flash over and is defined as rapid flames spread over one or more surfaces during a fire?

Answer 27

Flame over

Question 28

Warning signs of flashover may not be apparent in buildings with large unenclosed floor or attic spaces and ceilings of how many feet above the floor or hoist level?

Answer 28

12 to 20 feet

Question 29

For a backdraft to occur, oxygen content must fall to between what percentage?

Answer 29

11% to 15%

Question 30

For a backdraft, explosive products of combustion are what degrees higher well above their ignition temperature?

Answer 30

1000 to 1800 degrees

Question 31

Backdraft occurs during what stage of the fire?

Answer 31

Smoldering or decay

Question 32

Before flashover occurs the fire generally is fueled by what of the room or area?

Answer 32

Contents

Question 33

A building on fire is a building under what?

Answer 33

Demolition

Question 34

What are the 4 construction features that present the greatest danger to firefighters from collapse?

Answer 34

Truss construction URM construction Cantilever construction Unprotected steel construction

Question 35

Firefighter survival begins with what?

Answer 35

Pre fire planning Preparation Training

Question 36

Provide a minimum of 2 ladders to every structure and 1 additional ladder for every how many members on the roof?

Answer 36

2 member team