Question: What do you understand by mechanical and thermal efficiency? A steam plant uses 3 tonne of (mathrm{coal} / mathrm{h}). The steam is fed to turbine

What do you understand by mechanical and thermal efficiency? A steam plant uses 3 tonne of $\mathrm{coal} / \mathrm{h}$. The steam is fed to turbine the output of which is $4 \mathrm{MW}$. The calorific value of the coal is 30 $\mathrm{MJ} / \mathrm{kg}$ calculate the thermal efficiency of the plant.

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