Class 4 (4th Engineer) SC&S 📅 Apr 2024

Exam Question

A virtual rise in the center of gravity of a ship may be caused by

(a) Filling a partially filled tank

(b) Using an onboard crane to lift a freely swinging heavy object

(d) Transferring pipe from the setback area to the pipe rack

Briefly Justify your Answer (16)

Reference Answer

### Correct Answer
The correct option is **(b) Using an onboard crane to lift a freely swinging heavy object**.
### Justification for Full Marks (16/16)
A "virtual rise" in the center of gravity (KG) refers to a situation where the ship's stability is reduced in a way that is mathematically equivalent to its solid center of gravity (G) having risen to a higher position (Gv). This results in a reduction of the metacentric height (GM) and the righting lever (GZ). While most commonly associated with the Free Surface Effect, the effect of a suspended load is another prime example.

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