How many stages are in the low pressure turbine?

How many stages are in the low pressure turbine?

• A. 3
• B. 4
• C. 5
• D. 6

Answer: (B)

The low pressure turbine is designed to extract the remaining energy from the gas flow after it has passed through the high pressure turbine, driving the fan and other low‑pressure components through a shaft. A turbine stage consists of a rotor and a fixed stator, and each stage extracts some energy as the gas expands and slows down. Four stages are a common, effective setup because they provide enough torque to drive the fan and accessories without adding unnecessary weight or aerodynamic losses. Too few stages would limit the power available to drive the fan, reducing thrust and efficiency, while more stages would add complexity and weight with diminishing returns. So, four stages strike a practical balance for typical engines.

The low pressure turbine is designed to extract the remaining energy from the gas flow after it has passed through the high pressure turbine, driving the fan and other low‑pressure components through a shaft. A turbine stage consists of a rotor and a fixed stator, and each stage extracts some energy as the gas expands and slows down. Four stages are a common, effective setup because they provide enough torque to drive the fan and accessories without adding unnecessary weight or aerodynamic losses. Too few stages would limit the power available to drive the fan, reducing thrust and efficiency, while more stages would add complexity and weight with diminishing returns. So, four stages strike a practical balance for typical engines.