F04 Portable Fire Extinguishers 2

Question 1

What is the primary advantage of a CO2 fire extinguisher over a dry chemical extinguisher when used on energized electrical equipment?

Accepted Answer

CO2 leaves no residue that could damage sensitive equipment

Answer

CO2 is more effective at cooling the fire

Answer

CO2 extinguishers have a longer discharge range

Answer

CO2 is effective on Class A fires

Question 2

A wet chemical (Class K) fire extinguisher is specifically designed for use in:

Accepted Answer

Commercial cooking operations with vegetable or animal oils

Answer

Electrical panel rooms

Answer

Warehouses storing flammable liquids

Answer

Locations with Class D metal fires

Question 3

Which type of portable fire extinguisher is most appropriate for a Class D (combustible metal) fire?

Accepted Answer

Specialized dry powder agent designed for the specific metal

Answer

ABC dry chemical

Answer

Carbon dioxide (CO2)

Answer

Water

Question 4

An extinguisher labeled '2-A:10-B:C' — what does the '2-A' rating indicate?

Accepted Answer

It is equivalent to approximately 2.5 gallons of water on Class A fires

Answer

The extinguisher weighs 2 pounds

Answer

It is effective on 2 square feet of Class B fire

Answer

It has a 2-minute discharge time

Question 5

Which extinguishing agent should NEVER be used on a fire involving a commercial deep fryer with cooking oil?

Accepted Answer

Water

Answer

Wet chemical

Answer

Purple K dry chemical

Answer

Class K foam

Question 6

A stored-pressure dry chemical extinguisher differs from a cartridge-operated unit in that:

Accepted Answer

Stored-pressure units hold the propellant gas pre-mixed with the dry chemical agent in one cylinder

Answer

Stored-pressure units have a separate CO2 cartridge to expel the agent

Answer

Stored-pressure units can only be used on Class B fires

Answer

Stored-pressure units require recharging after each monthly inspection

Question 7

Clean agent extinguishers (such as those using Halon alternatives like FM-200) are preferred in server rooms because they:

Accepted Answer

Extinguish fires without leaving residue or depleting oxygen to dangerous levels

Answer

Are less expensive than CO2 units

Answer

Have a longer effective range than other extinguishers

Answer

Are rated for Class D metal fires