Quiz 9A - Week 3

1. Initial metacenter height is called:

• • KM, from keel to metacenter

• • KB, from hull to B center

• • GM, from G to trim angle

• • GZ, from heel to upright

2. Higher KM gives more:

• • Initial ship stability

• • Freeboard on all sides

• • Weight on the deck edge

• • Speed in rolling motion

3. KM value is affected by:

• • Wind force and speed

• • Draught and beam size

• • Crew movement on deck

• • Trim angle only at rest

4. As draft increases, KM:

• • Generally decreases

• • Increases with heel

• • Moves toward stern

• • Becomes metacentric radius

5. BB1 is related to:

• • Freeboard measurement tool

• • Trim and list angle ratio

• • Shift in buoyant centroid

• • Fuel oil tank movement

6. KM is computed from:

• • GZ multiplied by GM

• • KB plus BM value

• • TPC times the list angle

• • Heeling moment divided by W

7. BM is defined as:

• • Height of bridge mast

• • Metacentric radius of vessel

• • Draft minus freeboard

• • Deck beam to hull distance

8. BM equals moment of inertia:

• • Times heel over mass

• • Divided by displacement

• • Plus hydrostatic pressure

• • Minus GZ per sine angle

9. For box-shaped ships, I equals:

• • KB times GM times draft

• • (L × B³) divided by 12

• • Beam squared times freeboard

• • Displacement over trim angle

10. KM formula for box vessel:

• • BM plus KB height

• • GM minus GZ vector

• • Length divided by breadth

• • Heel over wave period