GATE 2025 Mechanical Engineering Q52

Question

A thermal power plant is running with no reheat or regeneration. The specific enthalpy and specific entropy of steam at the turbine inlet are 3344 kJ kg⁻¹ and 6.5 kJ kg⁻¹ K⁻¹, respectively. The turbine isentropic efficiency is 0.9, and the mass flow rate of steam at the turbine inlet is 102 kg s⁻¹. The turbine power output is ________ MW (rounded off to 1 decimal place).
Properties of saturated liquid and saturated vapor at turbine exit pressure
Saturated liquid water
Specific enthalpy (kJ kg⁻¹): 341
Specific entropy (kJ kg⁻¹ K⁻¹): 1.1
Saturated water vapor
Specific enthalpy (kJ kg⁻¹): 2645
Specific entropy (kJ kg⁻¹ K⁻¹): 7.6

Accepted Answer

98.5 to 101.5