GATE ME 2025 Set 1 — Question 52
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Thermodynamics → Power Cycles → Rankine, Reheat & Regenerative
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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 and , respectively. The turbine isentropic efficiency is , and the mass flow rate of steam at the turbine inlet is . 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 | Saturated water vapor | ||
|---|---|---|---|
| Specific enthalpy () | Specific entropy () | Specific enthalpy () | Specific entropy () |
| 341 | 1.1 | 2645 | 7.6 |
Correct answer
98.5 to 101.5
Solution
1.Turbine inlet state (1): , .
2.Isentropic expansion to exit pressure (2s): .
3.At exit pressure: , , , .
4.Dryness fraction :
5.Isentropic enthalpy at exit :
.6.Actual enthalpy drop:
.7.Power output :
.Rounding to 1 decimal place gives MW.
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