FPE Fire Suppression Systems & Technology 3

Question 1

Which type of sprinkler is required in rack storage applications where in-rack sprinklers are installed below the top tier?

Accepted Answer

In-rack sprinklers with water shields

Answer

NFPA 13 requires water shields (also called water barriers or shields) on in-rack sprinklers below the top level to prevent prewetting from upper sprinklers.

Question 2

A wet chemical suppression system is most commonly installed to protect which type of hazard?

Accepted Answer

Commercial cooking equipment and hood systems

Answer

Wet chemical systems (NFPA 17A) are specifically designed for commercial cooking equipment, suppressing grease fires through saponification.

Question 3

In a CO2 total flooding system, the minimum design concentration for protecting a Class B surface fire hazard per NFPA 12 is:

Accepted Answer

34%

Answer

NFPA 12 requires a minimum CO2 concentration of 34% (by volume) for surface fire protection of Class B hazards.

Question 4

What does the term 'K-factor' represent in sprinkler system hydraulics?

Accepted Answer

Sprinkler discharge coefficient relating flow to pressure

Answer

The K-factor is the discharge coefficient in the formula Q = K√P, relating sprinkler flow (gpm) to operating pressure (psi).

Question 5

Under NFPA 750, water mist systems are classified by operating pressure. What pressure range defines a 'low-pressure' water mist system?

Accepted Answer

Below 175 psi

Answer

NFPA 750 defines low-pressure water mist systems as those operating at or below 175 psi (12.1 bar).

(FPE) Fire Protection Engineer Certification Practice Test

(FPE) Fire Protection Engineer Certification Practice Test

FPE Fire Suppression Systems & Technology 3