As chief engineer you should understand the...

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Question 1 of 2066636ef028f7522a1c5206ba

As chief engineer you should understand the concept of corrective measures and their purpose. The following four actions will have which affect on the vessel? 1) Add weight low and symmetrically about the centerline. 2) Remove high weight symmetrically. 3) Move weight down symmetrically. 4) Eliminate any free surface present.

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Question 1 of 20

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🔍 Key Concepts

• Center of gravity (G) vs metacenter (M) and how their relative positions affect stability and angle of loll • How adding/removing/moving weight vertically and symmetrically about the centerline changes the ship’s GM (metacentric height) and overall stability, not fore‑and‑aft trim • Effect of free surface on stability and why eliminating free surface changes GM but not trim by the head or stern

💭 Think About

• Ask yourself: Do these four actions mainly change the ship’s fore‑and‑aft trim, or do they mainly change her initial transverse stability (GM)? • Consider what happens to the center of gravity when you add weight low, remove weight high, move weight down, and remove free surface – does G move up or down, and what does that do to stability? • Think about when an angle of loll occurs: is it when stability is strong or weak, and would these actions make that situation better or worse?

✅ Before You Answer

• Verify whether all four actions together move the center of gravity up or down relative to the metacenter. • Check if any of these actions directly change weight distribution fore and aft, which would be needed to create or remove trim by the head or stern. • Confirm that eliminating free surface is primarily a transverse stability correction and not a trim correction.

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