Question 2576Deck Safety70% to pass
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.)
AI Explanation
The correct answer is D) Tanks: DB1, DT1.
To increase the calculated GM (Metacentric Height) from 2.7' to 2.9', you need to add weight low in the vessel to increase the vertical center of gravity (KG). Ballasting the double bottom tanks (DB1) and the deep tanks (DT1) will add weight low in the vessel, increasing the GM as desired.
The other options are incorrect because: A) only ballasting DB1 may not be enough to reach the target GM; B) ballasting DT6 in addition to DB1 and DT1 is unnecessary; and C) ballasting DB2 instead of DB1 may not achieve the desired effect.
Related Questions
#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. #2575 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.) #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.) #2579 You are on a Mariner class cargo vessel. Your drafts are: FWD 24'-00", AFT 25'-08". You wish to increase the calculated GM of 3.0' to 4.1'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.)