Question 2092 Deck Safety

The correct answer is C) remain unchanged. The free surface moment of a slack tank is the product of the free surface area of the liquid in the tank and the distance between the free surface and the vessel's longitudinal axis. When the vessel's displacement increases, the free surface area of the liquid in the tank remains the same, and the distance between the free surface and the longitudinal axis also remains unchanged. Therefore, the free surface moment of the slack tank remains unchanged as the displacement increases. The other options are incorrect because: A) the free surface moment is not inversely proportional to displacement, B) the free surface moment does not decrease with increased displacement, and D) the free surface moment does not increase with increased displacement.