Kort nozzles are installed around the propellers of some vessels to __________.

Correct Answer: Option A — increase the thrust of the propeller

Kort nozzles are hydrodynamically shaped shrouds surrounding the propeller. By controlling the flow of water into and out of the propeller disk, they increase the mass flow rate and reduce tip losses, significantly enhancing bollard pull and thrust efficiency, particularly at low speeds and during heavy towing operations.