What is the purpose of a water-motor gong?

• A. It Sounds When The Station Water Level Is Low
• B. It Signifies That Water Is Flowing In A Sprinkler System
• C. It Indicates A Pump Failure
• D. It Releases Air Pressure

Answer: (B)

The main idea being tested is that a water-motor gong is used to indicate water is flowing in a sprinkler system. When water begins moving through the piping—such as after a valve is opened or a sprinkler head releases—pressure drives a small motor inside the gong, which then strikes the gong and makes a loud sound. This audible signal quickly confirms to firefighters and building personnel that water is actually flowing and the sprinkler system is active or has been activated. It’s not about low water level, pump failure, or releasing air pressure—the device relies on water flow to operate. So the best answer is that it signifies water is flowing in the sprinkler system.