Engine : Steam Plants - 143/811
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| Guardian valves are installed on main propulsion turbines to __________. |
| A) provide an emergency means of quickly closing the throttle |
| B) prevent steam from leaking into the astern element while at full sea speed |
| C) prevent steam from leaking into the astern element while the vessel is maneuvering |
| D) provide a means to supply steam directly to the astern element of the turbine |
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