Question 207Motor Plants - Assistant Engineer

The correct answer is C) ensure a positive flow of oil at all times. Large main propulsion diesel engines use a duplex lube oil strainer to ensure that there is a continuous flow of clean, filtered oil to the engine's critical components. The duplex design allows for one strainer to be taken offline for cleaning or maintenance while the other strainer continues to provide oil flow, preventing any interruption in lubrication. This is a crucial safety feature to protect the engine and prevent damage. The other answer choices are incorrect because: A) decreasing cleaning time is not the primary purpose, B) the strainer may not remove all foreign objects, and D) the oil is only filtered once through the duplex system, not twice.