SS Majestic in dry dock in Southampton for repairs and repainting

The video discusses the necessity of paint drying underwater before a boat departs, due to the harsh conditions of the Atlantic Ocean. It highlights how the relentless churning of the ocean wears down massive propellers, necessitating their replacement after two years. The video also examines the chemical effects of seawater on phosphor bronze propellers, which become pitted beyond repair.

Why is it necessary for the paint to dry underwater before the boat leaves?

• To avoid environmental pollution

• To save time during the journey

• To prevent the paint from washing away

• To ensure the paint adheres properly

What is the main reason for replacing the propellers after two years?

• They are no longer efficient

• They are worn down by the ocean

• They become outdated

• They are too heavy

What is the weight of the propellers mentioned in the video?

• 25 tons

• 20 tons

• 15 tons

• 10 tons

What material is the propeller made of that is affected by seawater?

• Titanium

• Aluminum

• Stainless steel

• Phosphor bronze

What is the visible effect of seawater on the propeller?

• It gets pitted

• It becomes shiny

• It changes color

• It becomes lighter