The lubricating oil system supporting the...

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Question 1 of 2066636eef28f7522a1c51fde7

The lubricating oil system supporting the main propulsion reduction gear on the ship-docking tug to which you are assigned is fitted with a lube oil strainer as shown in the illustration. What strainer attribute will dictate the degree of filtration in terms of the particle size capable of being filtered? Illustration MO-0057

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Question 1 of 20

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🔍 Key Concepts

• Flow path of oil between the discs in a stack-type lube oil strainer • How clearance/gap size in a filter determines the maximum particle size that can pass • Difference between filtration fineness (micron rating) and total filtering area/capacity

💭 Think About

• Trace, in the illustration, exactly where the oil must squeeze through to go from dirty oil space to the clean oil outlet. Which single dimension along that path would physically block larger particles? • Look at each answer choice and ask: does this feature change the size of the opening a single particle must fit through, or does it mostly change how much oil and how much dirt the strainer can handle? • In a stack of discs, imagine sliding two discs closer together or farther apart. What changes in terms of particle size that can pass, and what changes if you simply add more discs without changing their spacing?

✅ Before You Answer

• Identify which part of the disc stack forms the narrowest passage for the oil flow; that is what controls particle size retention. • Distinguish between attributes that affect capacity/flow area (how much oil can pass, or how long before clogging) versus attributes that affect micron size (how small a particle is trapped). • Verify which option directly alters the minimum gap/opening between metal surfaces that the oil must pass through. That option is tied to filtration fineness.

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