Topic: Thermodynamics
In a gas turbine cycle, the turbine output is 600 KJ/kg and the compressor work is $400~KJ/kg$. If the heat supplied is 1000 KJ/kg, what is the thermal efficiency of this cycle?
- A. 80%
- B. 60%
- C. 40%
- D. 20%
Answer: D. 20%
Explanation: Net work output, $W_{net} = W_T - W_C = 600 - 400 = 200~KJ/kg$.
Heat supplied, $Q_{in} = 1000~KJ/kg$.
Thermal efficiency, $\eta = \frac{W_{net}}{Q_{in}} = \frac{200}{1000} = 0.20 = 20\\%$.