Merchant Marine Stability and Trim License Questions

The center of flotation of a vessel is __________. A. the center of volume of the immersed portion of the vessel B. the center of gravity of the water plane C. that point at which all the vertical downward forces of weight are considered to be concentrated D. that point at which all the vertical upward forces of buoyancy are considered to be concentrated

What is NOT a motion of the vessel? A. Pitch B. Roll C. Trim D. Yaw

A 7,000 ton displacement tankship carries two slack tanks of alcohol with a S.G. of 0.8. Each tank is 50 ft. long and 30 ft. wide. What is the reduction in GM due to free surface with the vessel floating in sea water, S.G. is 1.026? A. 0.36 ft   B.  0.46 ft   C.  0.72 ft   D. 0.82 ft

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

When water is used to fight a fire on board a ship, the effect of the weight of the water must be taken into account. How much sea water will increase the weight displacement by one ton? A. 64 cubic feet B. 35 cubic feet C. 100 gallons D. 500 liters

Forces within a vessel have caused a difference between the starboard and port drafts. This difference is called __________. A. list   B. heel   C. trim    D. flotation

The center of volume of the immersed portion of the hull is called the __________. A. center of buoyancy B. center of flotation C. center of gravity D. tipping center