Firefighter Protection Systems 3

Question 1

An OS&Y (outside screw and yoke) valve is used to do what in a sprinkler system?

Accepted Answer

Control the main water supply and show open/closed status

Answer

An OS&Y valve controls water supply and shows whether it is open or closed by the position of the visible stem.

Question 2

On an OS&Y valve, the system is OPEN when the threaded stem is in what position?

Accepted Answer

Extended outward (out)

Answer

When the stem protrudes out of the yoke, the valve is open; when retracted, it is closed.

Question 3

A Fire Department Connection (FDC) allows firefighters to do what?

Accepted Answer

Boost water pressure to a sprinkler or standpipe system

Answer

The FDC lets pumpers supplement the system's water supply and pressure during a fire.

Question 4

What is the primary purpose of a fire pump in a protection system?

Accepted Answer

To increase water pressure when municipal supply is inadequate

Answer

Fire pumps boost pressure for sprinklers and standpipes when the public supply cannot meet demand.

Question 5

A Class I standpipe system is intended primarily for use by whom?

Accepted Answer

Trained firefighters with 2½-inch connections

Answer

Class I standpipes provide 2½-inch outlets for use by fire department personnel.

Firefighter Practice Test