Question 2267 Deck Safety

70% to pass

In order to calculate the TPI of a vessel, for any given draft, it is necessary to divide the area of the waterplane by which of the following?

A 35
B 120
C 240
D 420
AI Explanation

The correct answer is D) 420. To calculate the Tons Per Inch (TPI) of a vessel, you need to divide the area of the waterplane by 420. This is a standard formula used in naval architecture and shipbuilding to determine how much the vessel's draft changes with changes in weight. The other answer choices are incorrect because they do not accurately represent the divisor used in the TPI calculation. A, B, and C are arbitrary numbers that do not have a direct relationship to the waterplane area or the calculation of TPI.

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