CFI Portable Fire Extinguishers & Suppression Equipment 2

Question 1

A carbon dioxide (CO2) fire extinguisher is being inspected. Which condition would require it to be removed from service?

Accepted Answer

Loss of more than 10% of its listed weight

Answer

NFPA 10 requires CO2 extinguishers to be removed from service and recharged if they have lost more than 10% of the net agent weight listed on the nameplate.

Question 2

What does the term 'hydrostatic testing' refer to in the context of portable fire extinguishers?

Accepted Answer

Pressure testing the extinguisher cylinder with water to verify structural integrity

Answer

Hydrostatic testing involves filling the cylinder with water and pressurizing it beyond operating pressure to verify the shell has no cracks, flaws, or leaks.

Question 3

Under NFPA 10, stored-pressure dry chemical extinguishers require hydrostatic testing at what interval?

Accepted Answer

Every 12 years

Answer

NFPA 10 requires stored-pressure dry chemical extinguishers to undergo hydrostatic testing every 12 years.

Question 4

A fire inspector observes that the inspection tag on an extinguisher shows the last inspection was 13 months ago. What is the correct action?

Accepted Answer

Document the finding and require immediate annual maintenance

Answer

NFPA 10 requires annual maintenance; an extinguisher with a tag showing over 12 months since the last inspection is overdue and must receive immediate maintenance.

Question 5

Which fire extinguisher class is rated for fires involving energized electrical equipment?

Accepted Answer

Class C

Answer

Class C extinguishers use non-conductive agents suitable for use on energized electrical equipment, preventing electrical shock to the operator.

(CFI) Certified Fire Inspector Practice Test

(CFI) Certified Fire Inspector Practice Test

CFI Portable Fire Extinguishers & Suppression Equipment 2