National Maritime Center

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Clementine Matthews
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1 National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 8

2 Choose the best answer to the following Multiple Choice Questions. 1. Which term indicates the rise in height of the bottom plating from the plane of the base line? (A) Deadrise o (B) Camber o (C) Molded height o (D) Sheer 2. Your vessel is discharging containers from the main deck with the ship's cranes. Which of the following must be taken into account when calculating the center of gravity as the containers are discharged? o (A) The vertical distance from the main deck plus the height of the container o (B) The vertical distance from the main deck plus half the height of the container (C) The vertical distance from the main deck plus the vertical distance to the head of the boom o (D) The vertical distance from the main deck to the heel of the boom plus half the height of the container 3. Which statement is FALSE with regards to the Great Lakes Light List? o (A) Volume VII does not include information on Class III private aids to navigation. o (B) The Light List should be corrected each week from the appropriate Notice to Mariners. (C) The Light List does not contain information on any of the navigational aids maintained by Canada. o (D) The Light List does not include Coast Guard mooring buoys, special purpose buoys, or buoys marking fish net areas. 4. When a wind force causes a vessel to heel to a static angle, the. o (A) deck-edge immersion occurs o (B) center of buoyancy remains the same o (C) centers of buoyancy and gravity are in the same vertical line (D) righting moment equals the wind-heeling moment Page 2 of 8

3 5. Which publication offers information on Great Lakes ice services? o (A) National Weather Service, Ice Outlooks o (B) Light List volume VII o (C) Marine Weather Log (D) U.S. Coast Pilot #6 6. There are basically three categories of water level fluctuations on the Great Lakes. What is NOT included as one of these? o (A) Short period fluctuations o (B) Seasonal fluctuations (C) Controlled outflow fluctuations o (D) Long range fluctuations 7. What is the meaning of a flag hoist consisting of the code letters "WM" (Whiskey Mike) when displayed by an icebreaker? o (A) "I am going ahead; follow me." o (B) "You should stop your vessel instantly." o (C) "Icebreaker support is finished." (D) "Icebreaker support is now commencing." 8. Which is the normal tendency for a loaded tanker? o (A) To be very tender o (B) Have a permanent list o (C) Hog (D) Sag 9. On the Great Lakes, which can cause short-term fluctuations in water levels? o (A) Calm winds o (B) Below normal rain fall (C) Seiches o (D) Steady barometric pressure Page 3 of 8

4 10. You are heading into the sea during rough weather. What may happen if there is too much weight forward in your small boat? o (A) The craft will broach (B) The craft may plunge into the wave o (C) The craft will list severely o (D) The craft will rise rapidly over the wave If choice B is selected set score to Your vessel is on a voyage from Ogdensburg, NY, to Chicago, IL, via the Great Lakes. The date is October 3 of the current year. If your vessel is subject to the load line requirements, using illustration D031DG below, to which of her marks should she be loaded? (A) Fresh water - Intermediate o (B) Salt water - Intermediate o (C) Fresh water - Winter o (D) Salt water - Winter 12. A thirty pound plate would be which thickness? (A) 3/4" thick o (B) 1" thick o (C) 1/2" thick o (D) 3/8" thick 13. A floating vessel will behave as if all of its weight is acting downward through which point? o (A) The center of buoyancy o (B) The center of flotation (C) The center of gravity o (D) The metacenter 14. Which describes nearly half of all storms that enter the Great Lakes Basin during the period from October through May? o (A) Highs which originate in the east and east central USA o (B) Highs which originate in north eastern and eastern Canada o (C) Lows which originate in north central and western Canada (D) Lows which originate in the central and western USA Page 4 of 8

5 15. When the forward drafts and the after drafts are averaged, which of the following describes the result? o (A) True mean draft o (B) Mean of the calculated drafts (C) Mean draft o (D) Draft at the center of flotation 16. Which term defines the horizontal fore-and-aft movement of a vessel? o (A) Sway (B) Surge o (C) Heave o (D) Yaw If choice B is selected set score to In which situation could a vessel most easily capsize? o (A) Anchored with your bow into the seas o (B) Running into head seas o (C) Running with following seas (D) Running in the trough 18. When is the phenomenon known as a "seiche" most likely to occur on Lake Erie? o (A) During the passage of a rapidly moving warm front o (B) When the Moon and Sun are in alignment o (C) Only during the months of May through August (D) When strong winds from the Northeast suddenly diminish 19. Ice concentration is measured in tenths. What concentration range of ice corresponds to "Close Pack"? o (A) 9-10 tenths (B) 7-8 tenths o (C) 4-6 tenths o (D) 1-3 tenths If choice B is selected set score to 1. Page 5 of 8

6 20. Your vessel is being assisted through an ice field in Thunder Bay by the Canadian Coast Guard icebreaker Alexander Henry. The starboard lookout reports that the icebreaker has run up the code flag "N" (November). Which action should you take? (A) Stop your engines o (B) Reduce speed o (C) Reverse your engines o (D) Stop your vessel instantly 21. Assume that your vessel has just entered Lake Erie by way of the Welland Canal and is proceeding in a southwesterly direction. Which statement about the aids to navigation you can expect to encounter along the route is TRUE? o (A) All red even-numbered buoys should be kept on your port side when proceeding in this direction. o (B) Lighted aids, fog signals, and radio beacons maintained by Canada are not included in the Great Lakes Light List. (C) The characteristics of buoys and other aids are as if "returning from seaward" when proceeding in this direction. o (D) All aids are maintained by the U.S. Coast Guard, 9th Coast Guard District, Cleveland, Ohio. 22. What does the line labeled "MS" indicate on the Great Lakes load line model shown in illustration D031DG below? o (A) Midseason o (B) Mean sea level o (C) Maximum submergence (D) Midsummer 23. The vertical motion of a floating vessel in which the entire hull is lifted by the force of the sea is known by which term? (A) Heave o (B) Pitch o (C) Surge o (D) Sway Page 6 of 8

7 24. In the absence of external forces, the center of buoyancy of an inclined vessel is vertically aligned directly below the. o (A) center of flotation o (B) amidships station o (C) geometric center of the waterplane area (D) center of gravity 25. Using the Guidance Manual for Loading the M.V. Grand Haven, determine the amount of ballast required in tank No. 3 (P & S) to maintain drafts of 17'-00" forward and 22'-06" aft for a vessel loaded with grain which has a test weight of 34 lbs. o (A) 1150 tons each o (B) 1180 tons each (C) 1220 tons each o (D) 1250 tons each Page 7 of 8

8 National Maritime Center Providing Credentials to Mariners D031DG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 8 of 8

National Maritime Center

National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 8 Choose the best answer to the following Multiple Choice questions. 1. On 1 September your 1115 zone time DR position