Which statement about turbine overspeed trip is correct?

• A. Trips the turbine if it is overloaded
• B. Is installed on all turbines
• C. Can be adjusted according to the load demand
• D. Disconnects the turbine load if the turbine overspeeds

Answer: (B)

The key idea here is that turbine overspeed protection is a safety shutdown feature that activates when rotational speed exceeds a safe limit. This protection is required on every turbine to prevent catastrophic damage if the governor fails and speed continues to climb.

The best answer reflects that mandatory installation on all turbines. Overspeed protection isn’t about protecting against overload or about adjusting to changing load demand; it’s a fixed-threshold safeguard designed to rapidly reduce speed (often by shutting off steam and/or triggering a trip) to keep the turbine from reaching damaging speeds. While tripping the turbine will typically cause the electrical load to drop as the generator disconnects, the primary function is to stop the turbine due to overspeed, not to manage load isolation itself.