The ________ stops the pumps and cuts power to the islands.

• A. Emergency shutoff valve
• B. E-Stop button
• C. Main circuit breaker
• D. Flow restrictor

Answer: (B)

When safety demands an immediate halt, the emergency stop button is the device that stops pumps and cuts power to the connected sections right away. It’s built to act instantly, sending a stop signal through the control circuit and bringing equipment to a safe state without delay. The other options aren’t as suitable here: an emergency shutoff valve controls fluid flow, not electrical power; a main circuit breaker can cut power but isn’t designed for the instantaneous, local stop of a single system or island; a flow restrictor changes flow, not machine power. So the emergency stop button is the correct choice for quickly stopping pumps and powering down the islands.