The main reduction gear performs which of the following functions?

Correct Answer: Option D — It transfers high-speed gas turbine rotation to low-speed propeller rotation

Gas turbines are high-speed prime movers, while propellers are low-speed thrust devices. The reduction gear is essential to bridge this speed gap, allowing the turbine to operate within its efficient high-speed range while simultaneously driving the propeller at a lower, more efficient speed for maritime propulsion.