The advantages of a dual shaft gas turbine arrangement are:

The dual shaft gas turbine arrangement features two shafts that operate independently. This design provides greater flexibility in operation because each shaft can be optimized for different conditions. For instance, the high-pressure shaft can operate at optimal speeds for maximum efficiency, while the low-pressure shaft can function effectively under varying load conditions. This allows for a more adaptable response to changing demands, enhancing overall operational flexibility.

Additionally, a significant advantage is that smaller starting motors can be used with a dual shaft arrangement. Since each shaft can be started and operated independently, the turbine requires less power to get each side up to operational speeds compared to a single shaft design, which needs a larger motor capable of handling the entire load. This reduction in motor size can lead to decreased overall system costs and a simplified starting process.

The other options suggest advantages that either do not accurately reflect the core benefits of a dual shaft configuration or misinterpret cost implications and pressure capabilities related to this specific turbine design. This dual shaft arrangement is particularly valued in applications where operational flexibility and efficient starting are critical.