Chapter 6 Fire Dynamics

Question 1

3 components of fire triangle

Answer 1

Fuel
Oxygen
Heat

Question 2

Most common oxidizing material in the atmosphere

Answer 2

 Oxygen

Question 3

Five classes of fire

Answer 3

A
B
C
D
K

Question 4

Class A fires

Answer 4

Ordinary combustibles

Question 5

Class B

Answer 5

Flammable petroleum products

Question 6

Class C

Answer 6

Electrical

Question 7

Class D

Answer 7

Combustible metals

Question 8

Class K

Answer 8

Combustible cooking fuels

Question 9

The extinguishing agent rapidly converts the burning substance to a noncombustible soap. This process is an ____ meaning it absorbs terminal energy from its surroundings.

Answer 9

Endothermic reaction

Question 10

____ is the cause of death and more than 50% of all fire fatalities

Answer 10

 Carbon monoxide poisoning

Question 11

Irritant released from burning polyethylene

Answer 11

Acrolein

Question 12

Deadly gas released from polyvinyl chloride

Answer 12

Hydrogen chloride

Question 13

Important aspects to consider determining the stage of fires growth

Answer 13

The shape and color of the flames
The density and color of the smoke
The pressure behind the smoke movement

Question 14

The growth of the fire depends on

Answer 14

The type of fuel
The physical property of the fuel
The surface of mass ratio
The arrangement of the fuel
Adequate ventilation

Question 15

If the fire grows, it can spread by four principal means

Answer 15

Convection
Radiation
Conduction
Direct flame impingement

Question 16

A critical point in the development of a room fire occurs when it reaches ____ the point in progression of a room fire when all the combustibles in the room have ignited

Answer 16

Flash over

Question 17

At the end of the free burning stages of fire and the smoke began to push out of the room under pressure spreading throughout the structure. The heating process is caused by -

Answer 17

Thermal radiation feedback

Question 18

Roll over a fire across the ceiling is one of the first signs that ___ is imminent

Answer 18

Flash over

Question 19

When oxygen starved fire in enclosed compartment, suddenly gets a fresh supply of air it will be ignite with an explosive force. The ignition is known as.

Answer 19

Backdraft

Question 20

___ smoke is indicative of hydrocarbon based fire such as plastic and foams

Answer 20

Dark black smoke

Question 21

___ smoke indicates an oxygen starved fire

Answer 21

Dirty brown

Question 22

The most abundant gas produced at any fire is?

Answer 22

Carbon monoxide

Question 23

What is the cause of death in more than 50 percent of all fire fatalities?

Answer 23

Carbon monoxide poisoning

Question 24

When fires involve natural and synthetic materials that contain nitrogen such as wool silk acrylonitrile, polyurethane, melamine, and nylons. The materials release?

Answer 24

Hydrogen cyanide

Question 25

The key to recognizing flashover is?

Answer 25

The smoke movement and fire growth

Question 26

_____ are common locations for backdrafts

Answer 26

Commercial occupancies

Question 27

One of the greatest fire hazards faced by firefighters and civilians is?

Answer 27

Smoke

Question 28

What was the main killer in the MGM Grand Hotel fire, the Beverly Hills Supper Club fire, the Winecoff Hotel fire, and many other fires throughout history?

Answer 28

Smoke

Question 29

Lighter smoke is indicative of?

Answer 29

Class A fires

Question 30

These are clues to a backdraft situation. When hose lines are charged and in place, ____ must take place prior to firefighters entering the structure. Horizontal ventilation Natural ventilation Positive pressure ventilation Vertical ventilation

Answer 30

Vertical ventilation