National Maritime Center

Transcription

1 National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 7

2 Choose the best answer to the following Multiple Choice Questions. 1. The sailing drafts are: FWD 14'-08", AFT 15'-06" and the GM is 4.8 feet. Use the information in Section 1, the blue pages, of the Stability Data Reference Book, to determine the available righting arm at 40 inclination. o (A) 3.3 feet o (B) 5.4 feet (C) 4.3 feet o (D) 3.7 feet 2. When flooding occurs in a damaged vessel, reserve buoyancy. (A) decreases o (B) remains the same o (C) increases o (D) shifts to the low side 3. Your drafts are: FWD 24'-09", AFT 27'-02". Use the blue pages of the Stability Data Reference Book to determine the vessels displacement if you are in fresh water. o (A) 13,075 tons (B) 13,350 tons o (C) 13,590 tons o (D) 13,700 tons If choice B is selected set score to 1. Page 2 of 7

3 4. You are loading in a port subject to the tropical load line mark and bound for a port subject to the summer load line mark. You will enter the summer zone after steaming four days. You will consume 41 tons of fuel, water, and stores per day. The hydrometer reading at the loading pier is and the average TPI is 55. What is the minimum freeboard required at the start of the voyage? Reference Table BL-0019 below. (A) 41 inches o (B) 55 inches o (C) 44 inches o (D) 49 inches 5. The SS AMERICAN MARINER is loaded with the cargo shown in table ST-0010 below. Use the white pages of The Stability Data Reference Book to determine the amount of liquid loading required in the double bottom tanks to meet a one compartment standard. o (A) 1211 tons o (B) 1172 tons (C) 1248 tons o (D) 1292 tons Page 3 of 7

4 6. The SS AMERICAN MARINER is ready to bunker with drafts of FWD 14'-04", AFT 17'-06". After all bunkers are on board, soundings indicate the tonnages shown in table ST-0180 below. Use the white pages of The Stability Data Reference Book to determine the free surface correction. o (A) 1.15 feet o (B) 1.25 feet o (C) 1.31 feet (D) 1.48 feet If choice D is selected set score to Use the floodable length curve in Section 1, the blue pages, of the Stability Data Reference Book. If the curve represents 45 percent permeability, and holds 1 and 2 flood, the vessel will sink if the permeability exceeds what percent? o (A) 19 o (B) 24 (C) 32 o (D) Use the material in Section 1, the blue pages, of the Stability Data Reference Book. If the KG is 22.0 feet, and the drafts are: FWD 23'-06", AFT 24'-03"; at what angle will the vessel lose positive stability? o (A) 76 o (B) 84 o (C) 89 (D) 98 If choice D is selected set score to 1. Page 4 of 7

5 9. The SS AMERICAN MARINER has the liquid load shown in table ST-0137 below. Use the white pages of The Stability Data Reference Book to determine the LCG-FP of the liquid load. o (A) ft o (B) ft (C) ft o (D) ft 10. You are loading in a port subject to the tropical load line mark and bound for a port subject to the summer load line mark. You will enter the summer zone after steaming two days. You will consume 28 tons of fuel, water, and stores per day. The hydrometer reading at the loading pier is 1.020, and the average TPI is 55. What is the minimum freeboard required at the start of the voyage? Reference Table BL-0021 below. (A) 74 inches o (B) 70 inches o (C) 66 inches o (D) 62 inches Page 5 of 7

6 11. Your sailing drafts are: FWD 17'-07", AFT 18'-05" and the GM is 3.4 feet. What will be the angle of list if #4 port double bottom (capacity 140 tons, VCG 2.6 feet, and 26 feet off the centerline) is filled with saltwater? (Use the data in Section 1, the blue pages, of the Stability Data Reference Book) o (A) Less than 1 o (B) 3 (C) 6 o (D) Your sailing drafts are: FWD 18'-03", AFT 19'-07" and the GM is 4.3 feet. What will be the angle of list if #2 starboard double bottom (capacity 78 tons, VCG 2.7 feet, and 24.5 feet off the centerline) is filled with saltwater? (Use the data in Section 1, the blue pages, of the Stability Data Reference Book) (A) 3 o (B) 5 o (C) 7 o (D) The SS AMERICAN MARINER arrived in port with drafts of: FWD 18'-10", AFT 18'-06". Cargo was loaded and discharged as indicated in table ST-0140 below. Use sheet 2 in the white pages of the Stability Data Reference Book to determine the final drafts. o (A) FWD 18'-02", AFT 19'-04" o (B) FWD 18'-06", AFT 19'-00" o (C) FWD 18'-00", AFT 19'-06" (D) FWD 18'-04", AFT 19'-02" If choice D is selected set score to A vessel carries three slack tanks of gasoline (SG.68). The vessel's displacement is 8,000 tons. Each tank is 50 ft. long and 20 ft. wide. What is the reduction in GM due to free surface with the vessel floating in sea water (SG 1.026)? o (A).20 feet (B).24 feet o (C).28 feet o (D).30 feet If choice B is selected set score to 1. Page 6 of 7

7 15. Using the information in Section 1, the blue pages, of the Stability Data Reference Book, determine the danger angle for permanent list if the KG is 21.8 feet and the drafts are: FWD 19'-05", AFT 20'- 01". (A) 26 o (B) 31 o (C) 52 o (D) 45 Page 7 of 7