Question 2471 Deck Safety

70% to pass

What is the reduction in metacentric height due to free surface when a tank 60 feet long and 30 feet wide is partially filled with salt water, and is fitted with a centerline bulkhead? (The vessel has a displacement of 10,000 tons.)

A 0.1 foot
B 0.8 foot
C 1.0 foot
D 1.2 feet
AI Explanation

The correct answer is A) 0.1 foot. The reduction in metacentric height due to free surface when a tank 60 feet long and 30 feet wide is partially filled with salt water and fitted with a centerline bulkhead can be calculated using the formula for free surface effect. With a displacement of 10,000 tons and the given tank dimensions, the reduction in metacentric height would be approximately 0.1 foot. The other answer choices are incorrect because they do not accurately reflect the relatively small free surface effect for a tank of this size on a vessel of 10,000 tons displacement. The free surface effect is minimized by the presence of the centerline bulkhead, resulting in the 0.1 foot reduction in metacentric height.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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