Paddle wheels are not used in modern ship propulsion systems.

The propeller generates thrust by pushing water backward, propelling the ship forward.

Diesel engines are widely used in large ships due to their reliability, efficiency, and relatively low maintenance costs.

The gearbox allows the propeller to rotate in the opposite direction, enabling the ship to go astern.

The propulsion system is not an auxiliary system; it is the main system responsible for propelling the ship.

The bilge pump removes water that accumulates in the bilge, which is the lowest part of the ship's hull.

Gas turbine engines on ships typically use natural gas as fuel due to its cleaner burning characteristics and lower emissions.

Ship stabilizers are used to reduce rolling motion, which can cause discomfort to passengers and crew and affect the ship's stability.

Controllable-pitch propellers allow for efficient operation at different ship speeds and can be adjusted to optimize thrust and fuel efficiency.

The rudder is used to steer the ship by changing the direction of water flow around the hull.

Nuclear propulsion systems are used in submarines to provide long-term underwater operation without the need for frequent refueling.

Anchors are used to secure the ship in place when it is not underway.

Diesel engines are widely used in small boats and recreational vessels due to their reliability, efficiency, and relatively low maintenance costs.

Boilers are used to generate steam, which is then used to power steam turbines or for other purposes on the ship.

Electric boats use electric motors powered by batteries or fuel cells for propulsion.