F80 Water Supply and Fire Suppression 4

Question 1

What is the minimum residual pressure required at the outlet of a fire hydrant during flow testing per NFPA 291?

Accepted Answer

20 psi

Answer

NFPA 291 requires a minimum residual pressure of 20 psi at the hydrant outlet during fire flow testing.

Question 2

A dry-pipe sprinkler system is most appropriate in locations where:

Accepted Answer

Pipes may be exposed to freezing temperatures

Answer

Dry-pipe systems use pressurized air or nitrogen to keep pipes dry, preventing water from freezing in unheated spaces.

Question 3

Which type of fire department connection (FDC) fitting is most commonly used in the United States?

Accepted Answer

NST (National Standard Thread)

Answer

NST (National Standard Thread), also called NH (National Hose), is the most widely used FDC fitting standard in the US.

Question 4

In a fire suppression water supply system, what does a 'dead-end main' refer to?

Accepted Answer

A water main fed from only one direction

Answer

A dead-end main is supplied from only one end, limiting flow capacity and creating water quality concerns.

Question 5

Which valve type is preferred for controlling water flow in fire protection systems because it provides a visual indication of its open or closed position?

Accepted Answer

OS&Y (Outside Screw and Yoke) gate valve

Answer

OS&Y gate valves expose the stem when open and retract it when closed, providing a clear visual indicator of valve position.

F80 Practice Test

F80 Practice Test

F80 Water Supply and Fire Suppression 4