CHIEF ENGINEER Unit 16 Q1

1 / 7

What is meant by the "critical period" when a vessel is settling onto dock blocks?

C) The time when cleaning and painting begin

B) The moment when the vessel's weight transfers from water buoyancy to dock blocks

A) The period when the crew exits the vessel

D) The period just before the vessel exits the dock

2 / 7

Why must docking personnel be especially vigilant during the critical period?

A) To ensure all crew are wearing proper safety gear

B) To monitor for any structural signs of stress or shifting of the vessel on the blocks

D) To prevent waves from disturbing the dock

C) To allow passengers to exit the vessel

3 / 7

Why is the critical period considered dangerous for the vessel’s structure?

C) The vessel experiences a loss of even buoyant support, which can create stress concentrations

A) The vessel is likely to slip off the blocks

D) The vessel is not held by any support during this period

B) The vessel undergoes rapid movement on the blocks

4 / 7

What additional measure can help ensure a safe transfer of weight during the critical period?

C) Quickly removing all water to accelerate settling

D) Only docking in shallow waters

A) Filling ballast tanks to increase weight on the blocks

B) Adjusting the block layout to match the hull’s support needs

5 / 7

What is one key way to reduce the risk associated with the critical period?

A) Increasing the speed of water drainage

C) Adding weight to the vessel during docking

B) Gradually lowering the water level to allow slow and controlled settling

D) Moving the vessel frequently during settling

6 / 7

Which of the following structural risks is increased during the critical period of dry-docking?

D) Lower fuel efficiency

C) Increased speed

A) Cargo shifting

B) Hull deformation or buckling

7 / 7

During the critical period, why is it essential to control the vessel’s descent onto the blocks carefully?

D) To allow crew members to disembark safely

C) To ensure an even distribution of the vessel's weight on the blocks

A) To prevent damaging the blocks themselves

B) To avoid any shift of cargo on board

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