Fire Extinguishers

Question 1

Class A

Answer 1

Ordinary combustibles

extinguished with water
class A foam
dry chemical
Green triangle

Question 2

Class B

Answer 2

Flammable liquids

Extinguished with CO2
Dry chemical
Class B foam
Red square

Question 3

Class C

Answer 3

Electrical

Turn power source off
Treat as Class A or B
Blue circle

Question 4

Class D

Answer 4

Metals

Use dry powder to extinguish
Do not use dry chemical
Yellow star

Question 5

Class K

Answer 5

Combustible cooking liquids

Extinguish with wet chemical
Portable extinguishers
Black octagon

Question 6

Smothering
chain breaking
saponification

Answer 6

Smothering- Excludes oxygen

chain breaking- Interrupts chemical chain reaction

saponification- Forms oxygen excluding foam

Question 7

Mechanisms to expel

Manual pump
Stored pressure
Pressure cartridge

Answer 7

Manual pump- physical pressure forces agent out nozel

Stored pressure- compressed Air or inert gas forces agent out nozzle

Pressure cartridge- external expelling forces agent out nozzle

Question 8

Types of extinguishers

Pump type
Stored pressure
Water misted store pressure
Wet chemical
Aqueous film forming foam
Clean agent

Answer 8

Pump type- use in class A
Stored pressure- small class a fires
Water misted store pressure-class C
Wet chemical- class K
Aqueous film forming foam-class B
Clean agent- smothers A and B

Question 9

CO2 extinguisher

Answer 9

Class B and C fires
dispersed by wind
limited reach

Question 10

Dry chemical

Answer 10

Regular- B:C rated
Multipurpose- A:B:C rated
May react chemically with others
Non toxic
May reduce visibility may create respiratory problem
Cartridge operated and stored pressure
Steps- knock down flames then smother area

Question 11

Dry powder

Answer 11

Class D metals
No single agent works on all metals
Creates smothering blanket
Steps- cover fire w powder, leave undisturbed

Question 12

Class A ratings

Answer 12

1-A through 40-A

1-A 5L of water
2-A 10L of water

Question 13

Class B ratings

Answer 13

1-B through 640-B

BasedOn the approximate square foot area of a flammable liquid fire a non-expert can extinguish

Question 14

Class C ratings

Answer 14

Not extinguishing compatibility test

Tester to determine nonconductivity

Question 15

Class D ratings

Answer 15

No Numerical rating

Based on type of combustible metal

Question 16

Class K

Answer 16

No numerical rating

Based on capability of saponifying cooking oils

Question 17

3 types of multipurpose class extinguishers

Answer 17

Class abc 
class ab 
class bc

Question 18

2main goals of extinguishers

Answer 18

Minimize risk to life and property

effectively extinguish fire

Question 19

Factors determing type of wxtinguisher

Answer 19

Fuel classification 
rating
 life hazards 
training 
atmosphere 
conditions 
ease of handling 
operational concerns

Question 20

PASS

Answer 20

Pick up
approach
squeeze
sweep

Question 21

Factors determining value

Answer 21

Serviceability
Accessibility
Simplicity