- Large reaction turbines have a higher overall efficiency compared to small reaction turbines due to their size.
- The larger size of the turbine allows for more efficient energy conversion and better flow control within the turbine.

- Large reaction turbines are designed to handle higher flow rates of fluid compared to small reaction turbines.
- This higher flow rate allows for better utilization of the kinetic energy of the fluid, resulting in higher efficiency.

- Large reaction turbines experience lower losses due to reduced friction and turbulence within the turbine.
- The larger size of the turbine results in smoother flow of the fluid, reducing energy losses and increasing overall efficiency.

- Large reaction turbines often have more sophisticated blade designs that are optimized for efficiency.
- The improved blade design allows for better energy extraction from the fluid, resulting in higher overall efficiency.

- Large reaction turbines benefit from economies of scale, allowing for lower cost per unit of energy produced.
- This cost advantage makes large reaction turbines a more attractive option for power generation compared to small reaction turbines.
In conclusion, the higher overall efficiency of large reaction turbines compared to small reaction turbines is a result of their size, higher flow rates, reduced losses, improved blade design, and economies of scale.