Which component automatically shuts down the engine when an overspeed is detected?

Which component automatically shuts down the engine when an overspeed is detected?

• A. Overspeed solenoid valve
• B. Beeping alarm
• C. NR indicator
• D. Cooling fan

Answer: (A)

When the engine speed reaches an unsafe level, the protection system must automatically stop the engine to prevent damage. The device that does this is the overspeed solenoid valve. When the overspeed condition is detected, the solenoid is energized and actuates the shutdown mechanism by cutting off the fuel supply (or isolating the fuel valve), causing the engine to stop promptly. This is why it’s the correct choice—the other options either provide only an alert (beeping alarm) or indicate status without triggering shutdown, or are unrelated to overspeed protection (cooling fan).

When the engine speed reaches an unsafe level, the protection system must automatically stop the engine to prevent damage. The device that does this is the overspeed solenoid valve. When the overspeed condition is detected, the solenoid is energized and actuates the shutdown mechanism by cutting off the fuel supply (or isolating the fuel valve), causing the engine to stop promptly. This is why it’s the correct choice—the other options either provide only an alert (beeping alarm) or indicate status without triggering shutdown, or are unrelated to overspeed protection (cooling fan).