Portable fire extinguishers

Question 1

When is the only time that portable fire extinguishers should be used?

Answer 1

For incipient fires and early growth fires.

Question 2

How are fire extinguishers classified?

Answer 2

According to the fire size that they are designed to extinguish

Question 3

What are the five fire extinguisher classes?

Answer 3

A, B, C, D, and K

Question 4

What are the combustibles of class A fire extinguishers?

Answer 4

Textiles, paper, plastics, rubber and wood.

-They can all be extinguished with water, foam and dry chemicals.

Question 5

How many litres of water would a 30-A fire extinguisher have?

Answer 5

5x30=150L

Question 6

What is the upper limit for class A fire extinguishers in terms of liters?

Answer 6

5x40 = 200L

Question 7

What combustibles does class B involve?

Answer 7

Flammable and combustible liquids and gases such as alcohol, gas, lubricating oils and propane.

Question 8

What substances are uses in class B extinguishers?

Answer 8

CO2, dry chemicals, Class B foam.

Question 9

How many square feet can a 500-B extinguisher cover when used by a civilian?

Answer 9

500. the upper limit is 640 square feet.

Question 10

What is a class C rating?

Answer 10

it is able to be used to extinguish charged electrical fires.

Question 11

What combustibles are involved in Class D extinguishers?

Answer 11

Combustible metals like lithium, sodium. potassium

Question 12

Why can’t water be used to extinguish combustible metal fires?

Answer 12

The water will react violently with the metal and could discharge molten metal.

Question 13

Can firefighters use dry chemical extinguishers on combustible metal fires?

Answer 13

No only class D dry powders

Question 14

Can firefighters use Class D extinguishers on other types of fires?

Answer 14

No

Question 15

What kinds of fires are Class K extinguishers used for?

Answer 15

Combustible cooking oils.

Question 16

What is inside of Class K extinguishers?

Answer 16

liquid alkaline mixture, known as wet chemical systems. it smothers the vapors of oil fires.

Question 17

What are the four ways in which extinguishers act upon the combustibles?

Answer 17

• Smothering
• Cooling
• Chemical flame inhibition
• Saponification

Question 18

What are the three methods of extinguisher expelation?

Answer 18

Manual pump
Stored Pressure
Pressure cartridge

Question 19

In what two ways do AFFF extinguishers differ from stored-pressure water extinguishers?

Answer 19

• AFFF has a specified amount of AFFF concentrate mixed with water to form a foam mixture.
• AFFF has an air-aspirating foam nozzle, which creates better quality foam.

Question 20

True or false? you can use an AFFF extinguisher for flowing fuels.

Answer 20

False, you can only use them for stagnant fuels

Question 21

What are halotron extinguishers?

Answer 21

They are used in expensive electrical circuits like airplane cockpits and computer fires. They smother the fire without damaging the technology and the ozone layer.

Question 22

When are CO2 extinguishers used?

Answer 22

They are used for Class B and Class C fires.

Question 23

What is the difference between a dry chemical extinguisher and a dry powder extinguisher?

Answer 23

Dry chemical are used for Class ABC and class BC, while dry powder are used for Class D

Question 24

When many extinguisher options are available, how to decide which is the best?

Answer 24

We want to minimize damage to life and property, while still being able to extinguish the fire. We must concider:

• Classification of the burning fuel
• Hazards to protect against
• Atmospheric conditions
• Ease of handling
• Rating of extinguisher
• Size and intesity of fire
• Availability of trained personel
• Any hazards to life or operational concerns

Question 25

What is the PASS application method?

Answer 25

Pull Aim Squeeze Sweep

Question 26

What four things should be inspected on a fire extinguisher before use?

Answer 26

External condition
Hose/nozzle
weight
pressure gauge