Question 636Steam Plants - Assistant Engineer70% to pass
If the main and standby lube oil service pumps of the main engine fail while underway at sea, _______________.
AI Explanation
The correct answer is D. An emergency supply of oil in the gravity tank will provide time to crash stop the turbine and gears.
The reasoning behind this is that the gravity tank is designed to provide a backup supply of lubricating oil in the event of a failure of the main and standby lube oil service pumps. This emergency oil supply allows the operator to safely shut down the engine and turbine before any critical bearings fail. The other options are incorrect because the turbine and reduction gear bearings will not immediately fail if the main lube oil pumps fail, and the hand pump is not intended to provide full emergency lubrication. The gravity tank is the proper emergency system to allow a controlled shutdown.
Related Questions
#634 Where are moisture shields located in a main propulsion steam turbine? #635 The astern element of a main propulsion turbine is usually designed as a/an _______________.#637 In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the _______________.#638 The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities? #639 The over speed tripping device installed on an auxiliary turbine is automatically actuated by _______________.