National Maritime Center Serving Our Nation’s Mariners

U.S.C.G. Merchant Marine Exam

Master/Chief Mate of Unlimited Tonnage

Q104 Deck Safety – Stability Problems

(Sample Examination)

Page 1 of 10 Q104 Deck Safety – Stability Problems

8/29/2019

Q104 Deck Safety-Stability Problems U.S.C.G. Merchant Marine Exam Master/Chief Mate of Unlimited Tonnage Illustrations: 1

Choose the best answer to the following Multiple Choice Questions.

1. The liquid mud tanks on your vessel measure 22'L by 16'B by 7'D. The vessel's displacement is 568T and the specific gravity of the mud is 1.6. What is the reduction in GM due to a pair of these tanks(p/s) being slack?

o (A) 0.56 footo (B) 0.96 foot• (C) 1.18 feeto (D) 1.43 feet

If choice C is selected set score to 1.

2. With no environmental forces, what is the center of gravity of an inclined vessel vertically alignedwith?

o (A) The original vertical centerline• (B) The center of buoyancyo (C) The longitudinal centerlineo (D) The center of flotation

If choice B is selected set score to 1.

3. You are loading in a port subject to the tropical load line mark and bound for a port subject to thewinter load line mark. You will enter the summer zone after steaming six days. You will enter thewinter zone after an additional three days. You will consume 28 tons of fuel, water, and stores perday. The hydrometer reading at the loading pier is 1.020, and the average TPI is 46. What is theminimum freeboard required at the start of the voyage? Reference Table BL-0012 below.

o (A) 70.6 incheso (B) 61.4 incheso (C) 77.5 inches• (D) 64.5 inches

If choice D is selected set score to 1.

Page 2 of 10 Q104 Deck Safety – Stability Problems

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Q104 Deck Safety-Stability Problems U.S.C.G. Merchant Marine Exam Master/Chief Mate of Unlimited Tonnage Illustrations: 1

4. Your sailing drafts are: FWD 24'-02", AFT 24'-10" and the GM is 4.6 feet. What will be the angle oflist if #6 starboard double bottom (capacity 95 tons, VCG 2.6 feet, and 21 feet off the centerline) isfilled with saltwater? (Use the data in Section 1, the blue pages, of the Stability Data ReferenceBook)

o (A) Less than 1°• (B) 2°o (C) 4°o (D) 7°

If choice B is selected set score to 1.

5. Your sailing drafts are: FWD 17'-07", AFT 18'-03" and the GM is 2.8 feet. What will be the angle oflist if the #4 starboard double bottom (capacity 141 tons, VCG 2.6 feet, and 23.8 feet off thecenterline) is filled with saltwater? (Use the data in Section 1, the blue pages, of the Stability DataReference Book)

o (A) 6°• (B) 8°o (C) 10°o (D) 12°

If choice B is selected set score to 1.

6. The SS AMERICAN MARINER has the liquid load shown in table ST-0122 below. Use the whitepages of The Stability Data Reference Book to determine the LCG-FP of the liquid load.

o (A) 271.2 ft• (B) 291.0 fto (C) 288.8 fto (D) 305.3 ft

If choice B is selected set score to 1.

Page 3 of 10 Q104 Deck Safety – Stability Problems

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Q104 Deck Safety-Stability Problems U.S.C.G. Merchant Marine Exam Master/Chief Mate of Unlimited Tonnage Illustrations: 1

7. Use the material in Section 1, the blue pages, of the Stability Data Reference Book. If the KG is 25.2feet, and the drafts are: FWD 22'-03", AFT 23'-01"; at what angle will the vessel lose positivestability?

o (A) 92°o (B) 77°• (C) 68°o (D) 61°

If choice C is selected set score to 1.

8. Use the floodable length curve in Section 1, the blue pages, of the Stability Data Reference Book. Ifthe curve represents 45 percent permeability and number 5 hold floods, the vessel will sink if thepermeability exceeds what percent?

• (A) 66%o (B) 70%o (C) 74%o (D) 79%

If choice A is selected set score to 1.

9. Using the information in Section 1, the blue pages, of the Stability Data Reference Book, determinethe danger angle for permanent list if the KG is 21.8 feet and the drafts are: FWD 23'-05", AFT 24'-04".

o (A) 21°• (B) 26°o (C) 31°o (D) 37°

If choice B is selected set score to 1.

10. Your vessel's drafts are: FWD 17'-05", AFT 20'-01"; and the KG is 25.6 feet. What is the rightingmoment when the vessel is inclined to 45°? (Use the reference material in Section 1, the blue pages,of the Stability Data Reference Book)

o (A) 18,294 foot-tons• (B) 19,709 foot-tonso (C) 21,137 foot-tonso (D) 22,002 foot-tons

If choice B is selected set score to 1.

Page 4 of 10 Q104 Deck Safety – Stability Problems

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Q104 Deck Safety-Stability Problems U.S.C.G. Merchant Marine Exam Master/Chief Mate of Unlimited Tonnage Illustrations: 1 11. Your drafts are: FWD 23'-03", AFT 27'-01". Use the blue pages of the Stability Data Reference Book

to determine the vessels displacement if you are in fresh water.

o (A) 12,550 tons • (B) 12,900 tons o (C) 13,200 tons o (D) 13,350 tons

If choice B is selected set score to 1.

12. The SS AMERICAN MARINER is ready to bunker with drafts of FWD 14'-04", AFT 18'-08". After all bunkers are on board, soundings indicate the tonnages shown in table ST-0173 below. Use the white pages of The Stability Data Reference Book to determine the free surface correction.

• (A) 1.05 feet o (B) 1.15 feet o (C) 1.25 feet o (D) 1.31 feet

If choice A is selected set score to 1.

13. Your drafts are: FWD 6'-01", AFT 6'-10". From past experience, you know that the vessel will increase her draft 1 inch for every 6 tons loaded. There is rig water on board and 11 tons of deck cargo. How many more tons of cargo can be loaded and still maintain the same trim? See illustration D037DG below.

o (A) 6 tons • (B) 12 tons o (C) 18 tons o (D) 24 tons

If choice B is selected set score to 1.

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Q104 Deck Safety-Stability Problems U.S.C.G. Merchant Marine Exam Master/Chief Mate of Unlimited Tonnage Illustrations: 1

14. You are loading cargo on deck aboard a vessel whose beam is 60 feet and full period of roll is 20seconds. What is the estimated metacentric height of the vessel?

o (A) 1.3 fto (B) 1.5 ft• (C) 1.7 fto (D) 1.9 ft

If choice C is selected set score to 1.

15. The SS AMERICAN MARINER arrived in port with drafts of: FWD28'-04", AFT 30'-11". Cargo wasloaded and discharged as indicated in table ST-0009 below. Use sheet 2 in the white pages of theStability Data Reference Book to determine the final drafts.

• (A) FWD 29'-01", AFT 30'-10"o (B) FWD 29'-08", AFT 30'-06"o (C) FWD 29'-03", AFT 30'-08"o (D) FWD 29'-07", AFT 30'-08"

If choice A is selected set score to 1.

Page 6 of 10 Q104 Deck Safety – Stability Problems

8/29/2019

National Maritime Center

Serving Our Nation's Mariners

8/30/2018

D031NG

Adapted for testing purposes only from BOWDITCH, The American Practical Navigator,

An Epitome of Navigation, Volume I, 1984 Edition

Copyright © 1984 by the Defense Mapping Agency Hydrographic/Topographic Center

Further reproduction prohibited without permission Page 7 of 10

Q104 Deck Safety – Stability Problems

National Maritime Center

Serving Our Nation's Mariners

9/6/2018

D041NG

Adapted for testing purposes only from U.S. Department of Commerce

National Oceanic and Atmospheric Administration

National Weather Service

Further reproduction prohibited without permission Page 8 of 10

Q104 Deck Safety – Stability Problems

National Maritime Center

Serving Our Nation's Mariners

9/10/2018

D045NG

Adapted for testing purposes only from CUTLER, Dutton’s Nautical Navigation, 15th edition

Copyright © 2004 by the U.S. Naval Institute

Further reproduction prohibited without permission Page 9 of 10

Q104 Deck Safety – Stability Problems

National Maritime Center

Serving Our Nation's Mariners

9/10/2018

D047NG

Adapted for testing purposes only from BOWDITCH, The American Practical Navigator,

An Epitome of Navigation, 2002 Bicentennial Edition

Copyright © 2002 by The National Imagery and Mapping Agency, U. S. Government

Further reproduction prohibited without permission Page 10 of 10

Q104 Deck Safety – Stability Problems