Question 2575Deck Safety70% to pass
You are on a Mariner class cargo vessel. Your drafts are: FWD 17'-04", AFT 19'-04". You wish to increase the calculated GM of 3.0' to 4.2'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.)
AI Explanation
The correct answer is A) Tanks: DB3, DB4.
To increase the calculated GM (Metacentric Height) from 3.0' to 4.2', you need to increase the vessel's righting moment. This can be achieved by ballasting the tanks that have the greatest impact on the vessel's stability. According to the Stability Data Reference Book, the tanks DB3 and DB4 have the largest lever arms (distance from the center of gravity) and will provide the most effective increase in righting moment to achieve the desired GM of 4.2'.
The other answer choices are incorrect because they either do not have the largest lever arms (B, C, D) or do not provide the necessary increase in righting moment to reach the target GM (B, C, D).
Related Questions
#2573 The SS AMERICAN MARINER is ready to sail with the load shown in table ST- 0149 below. Use the white pages of The Stability Data Reference Book to determine the available GM. #2574 The SS American Mariner is ready to sail with the load shown in Table ST-0183 below. Use the white pages of the Stability data Reference Book to determine the available GM. #2576 You are on a Mariner class cargo vessel. Your drafts are: FWD 26'-06", AFT 28'-02". You wish to increase the calculated GM of 2.7' to 2.9'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.) #2577 You are on a Mariner class cargo vessel. Your drafts are: FWD 21'-04", AFT 23'-04". You wish to increase the calculated GM of 4.8' to 5.8'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.) #2578 You are on a Mariner class cargo vessel. Your drafts are: FWD 22'-06", AFT 25'-06". You wish to increase the calculated GM of 4.8' to 5.9'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.)