Discussion
A turbine produces \( 30 \ \mathrm{MW} \) at a mass flow of \( 55 \ \mathrm{kg/s} \). The specific work is approximately
Answer: D
Correct answer: 545 kJ/kg
Specific work is power over mass flow:
\[ w = \frac{30 \times 10^6}{55} \approx 545\,000 \ \mathrm{J/kg} = 545 \ \mathrm{kJ/kg} \]Which at a \( c_p \) of 1150 corresponds to a total temperature drop of about 475 K across the turbine - a figure typical of a high pressure turbine driving a large compressor.
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