Which statement about turbine overspeed trip is accurate according to standard practice?

• 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 is safety protection: a turbine overspeed trip is a protective device that automatically shuts the turbine down when speed tries to exceed a safe limit. Because overspeed can happen if the governor fails or steam control misbehaves, every turbine needs this protection. That’s why the statement that it is installed on all turbines is the best fit with standard practice.

Overload-related tripping is governed by different protection (load control or governor action) and not by overspeed protection, so that option isn’t correct. Overspeed protection isn’t something you normally adjust to match load demand; its purpose is a rapid, non-adjustable safety response at a fixed speed threshold. And while tripping the turbine will stop generation and thus remove load from the system, the primary function of the overspeed trip is to shut the turbine down to prevent mechanical damage, not to selectively disconnect load based on overspeed.