F80 Water Supply and Fire Suppression

Question 1

According to NFPA 291 color coding, what color bonnet indicates a fire hydrant with a flow capacity of 1,500 GPM or greater?

Accepted Answer

Blue

Answer

NFPA 291 recommends blue bonnets for hydrants capable of delivering 1,500 GPM or more at 20 psi residual pressure.

Question 2

Which type of sprinkler head activates only at the individual head directly exposed to sufficient heat?

Accepted Answer

Closed-head sprinkler with a fusible link or glass bulb

Answer

Closed-head sprinklers activate individually only when their fusible link or glass bulb is exposed to enough heat, limiting water discharge to the fire area.

Question 3

What does residual pressure measure during a fire hydrant flow test?

Accepted Answer

Pressure remaining in the water distribution system while water is actively flowing

Answer

Residual pressure is the pressure remaining in the water supply system while water is flowing at the test hydrant, indicating available supply during firefighting operations.

Question 4

What is the primary function of a Post Indicator Valve (PIV)?

Accepted Answer

To provide a visible open/shut indication of a water control valve without entering the building

Answer

A Post Indicator Valve shows 'OPEN' or 'SHUT' through a window in the post, allowing personnel to verify valve status from outside the building.

Question 5

What extinguishing agent is used in Class D fire extinguishers for combustible metal fires?

Accepted Answer

Specialized dry powder formulated for the specific metal involved

Answer

Class D extinguishers use dry powder agents specifically formulated for the combustible metal involved, such as sodium chloride for magnesium or graphite-based powder for sodium.

F80 Practice Test Practice Test

F80 Practice Test Practice Test

F80 Water Supply and Fire Suppression