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LAFD TOWER 23-4 > Extinguishers > Flashcards

Extinguishers Flashcards

1
Q

Class A Fires are what

A

ordinary combustables

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2
Q

Class B Fires are what

A

Flammable liquids

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3
Q

Class C fires are what

A

Electrical

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4
Q

Class D Fires are what

A

Combustible metals

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5
Q

Water gun specs

A

stainless steel, 2 1/2 gallons, 90-110 psi, wet water added

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6
Q

Carbon Dioxide Extinguisher specs

A

20 lb net weight, safety disk ruptures at 135 degrees, 60 second discharge time, 800-900psi, non-conductive handle, refill at 15lb net weight

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7
Q

CO2 extinguishers are ____ times heavier than air

A

1.5

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8
Q

The expansion ratio of CO2 extinguishers is?

A

450:1

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9
Q

the pressure of CO2 extinguishers is

A

800-900 psi

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10
Q

Dry Chem extinguishers effective range

A

15-20 ft

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11
Q

Dry chem utilizes a ____ degree fan stream

A

60 degree

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12
Q

Dry chem extinguishes the fire by

A

releasing carbon dioxide and water vapors.
cools through absorption of solid particles.
Free Radical quenching

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13
Q

Dry chem is how many more times effective as CO2 on hydrocarbon fires?

A

twice

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14
Q

To operate a extinguisher you

A

Pull
Aim
Squeeze
Sweep

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15
Q

A water gun is rated at

A

2A

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16
Q

How do you release all the pressure from a Water Gun?

A

hold it upside down and open the valve

17
Q

When refilling, you should fill the water gun how many inches from the top?

A

6 inches

18
Q

Dry chem extinguishers are tested to what PSI

A

600

19
Q

How many lbs of dry chem is an extinguisher filled with

A

20

20
Q

The average operator can extinguish how many square feet of class b fire

A

20

21
Q

Dry chem extinguisher is pressurized to what

A

165 psi

22
Q

The effective range of dry chem is

A

15-20 fr

23
Q

A dry chem extinguisher should be maintained between what psi

A

125-175

24
Q

A carbon dioxide extinguisher is used on

A

Liquid or electrical fires

not effective on metal fires

25
Q

Dry chem consists of what

A

Sodium bicarbonate, NaHCO2 specially treated to make a caking moisture

26
Q

The water gun weighs how much

A

35 lbs

27
Q

When operating a water gun, you should be

A

Up hill
Up wind

28
Q

Discharge time for dry chem
Extinguisher

A

10 seconds

29
Q

To neutralize a oil
Spill, you should
Hold the dry chem extinguisher

A

2-3 ft above oil spill

30
Q

A cloud produced by dry chem
Can be used as a

A

Heat shield and is similar to
A heat arrestor

LAFD TOWER 23-4 (18 decks)

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