Chapter 1 Flashcards
What are class A fires?
Ordinary combustible materials
Wood, paper, textile, etc
Class A fire extinguishers are marked with?
Green triangle containing letter A
What are class B fires?
Flammable liquids, combustible liquids, petroleum, greases, tars, oils
Class B fire extinguishers are marked with
Red square with letter B
What are class C fires?
Energized electrical equipment
Class C fire extinguishers are marked with?
Blue circle containing letter C
What are class D fires?
Combustible metals
Aluminum, magnesium, titanium, sodium, and potassium
Class D fire extinguisher are marked with
Five point yellow star containing letter D
What are class K fires?
Vegetables oils, animal oils, or fat in cooking appliance fire
Class K fire extinguisher is marked with?
Marked with letter K or a black hexagon containing letter K
Heat is generated when a combustible material comes in contact with ___
A heat source
What are the 3 ways heat travels and causes a fire to extend?
Conduction, convection and radiation
Conduction is?
Heat transferred by conduction through contact of material
Heat that is conducted by a gas or liquid
Convection
Heat from a fire is _____ in all directions, including back toward the fire, which helps accelerate the chain reaction process
Radiation
What are the 5 stages of fire?
- Ignition
- Growth
- Flashover
- Fully developed
- Decay
The flashover stage is the transition between the ___
Growth stage and fully developed stage
____ is the backbone of a fire department
Training
____ is the first priority and must precede fire attack under backdraft conditions
Ventilation
An excellent method to keep training interesting is?
To foster a competitive spirit among various units
The responsibility of pre planning starts with?
The fire chief
The pre planning begins with?
On site survey
A problem facing the initial incident commander at a fire scene is?
How much water will be needed for effective fire control
The national fire academy quick needed fire flow calculation is?
Length x width / 3 = gpm
1 1/2 inch or 1 3/4 inch hose line flows?
2 1/2 inch hose line flows?
125-175 gpm
250 gpm
_____ is responsible for many areas. These include training, physical fitness, and mental readiness of the entire crew
Company officer
______ is a major part of leadership
Delegation
Tool used to develop not avoid work.
Permits subordinates to assume responsibility and to make decisions
_____ starts with the ability to possess self discipline
Leadership
_______ creates unnecessary excitement that can be contagious and lead to poor decision making and chaotic incident scene
Shouting
The attitude of safety must be initiated at ____ and be fully understood and enforced at all ranks
Fire chief level
An accident while responding places at risk?
- Those on the apparatus
- Pedestrians
- The drivers and passengers of other vehicles
- Those who placed the initial call for help
A simultaneous ignition of the surface area of the combustible materials in the fire space
Flashover
The pressurized water extinguisher (PW) can produce a ____ foot stream of water
40-50 foot
Class C fires are extinguished with
Dry chemical extinguisher and carbon dioxide extinguishers
What is the benefit of using carbon dioxide extinguishers?
They leave no residue
Purple K extinguishers are designed for?
Class C fires
And B
Conduction
Heat is transferred by conduction through contact of materials. When the materials touch the hotter material gives the less hotter material heat until they are equal
The ease of the spread of fire via conduction depends upon the materials involved.
Metal is a good heat conductor
Convection
Heat that is conducted by a gas or liquid
Air currents allow heat to rise through a structure, once the air currents reach the top of a fire area, the smoke and heat will start to spread laterally
The movement of heated air currents can spread the fire to uninvolved areas
Radiation
Heat from a fire is radiated in all directions, including back towards the fire, which helps accelerate the chain reaction process
Difference between flashover and backdraft
In flashover, there is adequate oxygen available for combustion and the fire is free burning prior to flashover. In a backdraft, there is insufficient oxygen for active burning, and the fire is smoldering
Professional drivers drive a minimum of 35 hours a week. A firefighter actual time driving a fire vehicle can be
10 hours a week, but typically much less
Stage of burning process where energy release is at its maximum rate and is limited only by availability of fuel and oxygen
Fully developed stage
Fire begins to develop, depending on the amount of fuel present and oxygen available
Growth stage
The stage of a fire at which the combustible contents of a compartment are totally in flame
Flashover
