Quiz 7A - Week 3

1. The center of gravity (G) is where:

• • Ship’s cargo force acts downward

• • Wind pressure acts on the hull

• • Total weight acts vertically down

• • Buoyancy force acts upward

2. When weights are secured, G will:

• • Remain fixed as ship heels

• • Move due to pitch motion

• • Shift toward the weather side

• • Oscillate with rudder force

3. Which force always acts downward?

• • Wind acting on superstructure

• • Lateral pressure on the hull

• • Ship’s total weight force (Wf)

• • Thrust from the ship’s propeller

4. G will move when a weight is:

• • Removed from the ballast tank

• • Shifted from one place to another

• • Balanced at the same location

• • Immersed below the waterline

5. What must be calculated if G moves?

• • Shift of G using displacement

• • GM based on draft reading

• • Righting moment and GZ curve

• • LCB relative to waterplane area

6. Which does NOT shift G directly?

• • Weight loaded on the centerline

• • Ballast shifted inside one tank

• • Cargo moved from bow to stern

• • Items shifted above deck level

7. The key factor in ship’s stability is:

• • Trim condition of the vessel

• • Position of center of gravity

• • Vertical movement of metacenter

• • Buoyancy force from stern wedge

8. The officer handling cargo must:

• • Secure anchors and lashings

• • Understand gravity behavior

• • Read weather and wind reports

• • Align shafts with rudder post

9. Vertical position of G is measured:

• • From forecastle to bridgehead

• • From mast to midships beam

• • From keel to gravity center

• • From freeboard to bridgewing

10. KG and Kg are both measured in:

• • Liters per cargo loaded day

• • Tons per meter of heel

• • Pounds per square inch force

• • Meters from keel to location