Question 9Motor Plants - QMED

The correct answer is C) The engine itself must be stopped. When a slow-speed diesel engine is used to directly drive a fixed-pitch propeller, the only way to meet a stop order is to stop the engine itself. This is because there is no clutch or pitch control mechanism to disengage the propeller or change its pitch. The engine must be brought to a complete stop in order to stop the propeller's rotation and meet the stop order. The other answer choices are incorrect because disengaging the clutches (A) or changing the propeller pitch (D) do not apply in a direct-drive fixed-pitch propeller configuration, as there are no such mechanisms present. Stopping the engine (C) is the only way to immediately stop the propeller's rotation in this type of propulsion system.