Chapter 8- Engine Operations And Tactics Flashcards
Which type of foam is most effective for fires in flammable liquids?
Class B
A surfactant is designed to do what?
Reduce the Surface tension of water
Class A foams are designed to be used at less than what concentrate?
6%
A common cause of foam proportioner failure is what?
Air leaks at the fittings
The most common type of foam delivery system used on wildland engines is what?
NAFS
The higher the expansion rate of foam, the….
The longer lasting the foam
When should Class A foam not be used?
In or around water bodies
Foam protects fuels from ignition by doing what?
Suppressing volatile vapors
Wetting fuels
Insulating fuels from heat, flame and oxygen
A substance that reduces the flammability of a combustible is called what?
Retardant
Retardants are usually applied by what?
Air tankers
The difference between supply hose and attack hose is what?
Size
The Higbee cut indicates what?
Where the threads begin
In a straight roll, you should begin with what?
The male end of the hose
What are the nozzle classes?
Low volume
Handline
Master stream
The main cause of damage to hose, fittings and pump components is from what?
Water hammers
