What type of solenoids allows fluid flow while deenergized and stop flow when energized?

• A. Off-going clutch
• B. On-coming clutch
• C. Normally Closed
• D. Normally Open

Answer: (D)

This is about how a solenoid valve behaves when power is removed versus applied. A normally open valve is designed so the fluid path is open when the coil is not energized. When you energize the coil, magnetic force moves the internal parts to close that path, stopping the flow. So the valve allows flow in the deenergized state and stops flow when energized, which matches the scenario described. The other options describe clutch types or a valve that is closed when deenergized, which doesn’t fit this behavior.