Merchant Marine Stability and Trim License Questions

A vessel with a large GM will __________. A. have more resistance to listing in case of damage B. have less tendency to have synchronous rolling C. be less likely to have cargo shift D. ride more comfortably

A weight of 350 tons is loaded on your vessel 85 feet forward of the tipping center. The vessel's MT1 is 1150 foot-tons. What is the total change of trim? A. 12.93 inches  B. 23.75 inches  C. 25.87 inches  D. 38.50 inches

A cargo of 30 tons is to be loaded on deck 30 feet from the ship's centerline. The ship's displacement including the 30 tons cargo will be 9,000 tons and the GM will be 5 feet. The list of the vessel after loading this cargo will be __________. A. 1.14°  B. 2.05°  C. 2.31°  D. 3.40°

Your vessel has a forward draft of 26'-11" and an after draft of 29'-07". How many tons of cargo can be loaded before the vessel reaches a mean draft of 28'-06" if the TPI is 69? A.  204 tons B. 207 tons C. 210 tons D. 213 tons

Your vessel displaces 14,500 tons, with a longitudinal CG 247.5 ft. aft of the FP. If you pump 80 tons of ballast from forward to aft through a distance of 480 feet, your new CG will be __________. A. 244.85 feet aft of FP B. 246.22 feet aft of FP C. 248.87 feet aft of FP D. 250.15 feet aft of FP

You are reading the draft marks. The water level is at the bottom of number 11. What is the draft? A. 11'-06" B. 11'-00" C. 10'-09" D. 10'-06"

Before counterflooding to correct a list, you must be sure the list is due to __________. A. negative GM B. flooding C. off-center weight D. reserve buoyancy

A vessel's mean draft is 29'-07". At this draft, the TPI is 152. The mean draft after loading 1360 tons will be __________. A. 29'-09" B. 29'-11" C. 30'-04" D. 30'-07"

If the cause of severe list or trim is off-center ballast, counter flooding into empty tanks will _________. A. increase the righting moment B. increase the righting arm C. increase list or trim D. decrease list or trim

ship is inclined by moving a weight of 30 tons a distance of 30 ft. from the centerline. A 28-foot pendulum shows a deflection of 12 inches. Displacement including weight moved is 4,000 tons. KM is 27.64 feet. What is the KG? A. 21.34 feet B. 22.06 feet C. 22.76 feet D. 23.21 feet

Your vessel's draft is 16'-00" fwd. and 18'-00" aft. The MT1 is 500 ft-tons. How many tons of water must be shifted from the after peak to the forepeak, a distance of 250 feet, to bring her to an even draft forward and aft? A. 52 tons B. 50 tons C. 48 tons D. 24 tons

You are reading the draft marks. The top 2 inches of the 9 forward is visible above the water level, and the water level is four inches below the 10 aft. What is the mean draft? A. 9'-10" B. 9'-06" C. 9'-04" D. 9'-02"

A vessel aground may have negative GM since the __________. A. decrease in KM is equal to the loss of draft B. virtual rise of G is directly proportional to the remaining draft C. displacement lost acts at the point where the ship is aground D. lost buoyancy method is used to calculate KM, and KB is reduced

A weight of 250 tons is loaded on your vessel 95 feet forward of the tipping center. The vessel's MT1 is 1000 ft-tons. What is the total change of trim? A. 11.90 inches B. 18.75 inches C. 23.75 inches D. 38.01 inches

Which statement about the free surface correction is TRUE? A. It is added to GM at light drafts and subtracted at deep drafts. B It is increased if the slack tank is not on the centerline. C. It is decreased if the slack tank is below the KG of the vessel. D. The correction decreases as the draft increases.

When the height of the metacenter is the same as the height of the center of gravity, the metacentric height is equal to __________. A. the height of the metacenter B. the height of the center of gravity C. half the height of the metacenter D. zero

A virtual rise in the center of gravity may be caused by __________. A. filling a partially filled tank B. using fuel from a pressed fuel tank C. emptying a partially filled tank D. transferring ballast from the forepeak to the after peak

A vessel trimmed by the stern has a __________. A. list B. drag C. set D. sheer

Sixty (60) tons of cargo are raised with a heavy lift boom 45 feet from the centerline. The vessel's displacement including the weight lifted is 18,400 tons. The angle of list caused by the suspended weight is 1.5°, KM is 28.75 ft., and BM is 17.25 ft. What is the KG? A. 11.65 feet B. 22.85 feet C. 23.15 feet D. 23.82 feet

You are at sea on a vessel whose beam is 60 feet and full period of roll is 20 seconds. What is the estimated metacentric height of the vessel? A. 1.3 ft    B.  1.5 ft    C.  1.7 ft    D.  1.9 ft

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An upright vessel has negative GM. GM becomes positive at the angle of loll because the __________. A. free surface effects are reduced due to pocketing B. KG is reduced as the vessel seeks the angle of loll C. effective beam is increased causing BM to increase D. underwater volume of the hull is increased

For a small angle of heel to port, the center of buoyancy will __________. A. move to port B. move to starboard C. move directly down D. stay in the same position

If a vessel lists to port, the center of buoyancy will __________. A. move to port B. move to starboard move C. directly down D. stay in the same position

A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis, how will the value of the moment of inertia of the free surface be affected? A. The moment of inertia would remain unchanged. B. The moment of inertia would be 1/4 its original value. C. The moment of inertia would be 1/2 the original value. D. None of the above

A ship's forward draft is 22'-04" and its after draft is 24'-00". The draft amidships is 23'-04". This indicates aconcentration of weight __________. A. at the bow B. in the lower holds C. amidships D. at the ends

A vessel is described as a two compartment vessel when it __________. A. has no more than two compartments B. has two compartments in addition to the engine room C. will sink if any two compartments are flooded D. will float if any two adjacent compartments are flooded

Determine the free surface correction for a fuel oil tank 30 ft. long by 40 ft. wide by 15 ft. deep, with a free surface constant of 3794. The vessel is displacing 7,000 tons in saltwater. A. 0.35 foot B. 0.54 foot C. 0.65 foot D. 1.38 feet

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The percentage of the total surface area or volume of a flooded compartment that can be occupied by water caused by damage is known as __________. A. one compartment standard B. center of flotation C.  permeability D. form gain