• # question_answer In an axial flow gas turbine, the hot gases approach the rotor inlet with an absolute velocity of 600 m/s in a direction $30{}^\circ$ from the wheel tangent. The gases leave the rotor axially. If the blade speed is 300 m/s, then the theoretical power output per kg/s of gas flow will be approximately: A) 132 kW            B) 156 kWC) 172 kW            D) 205 kW.

${{v}_{w\,1}}=v{{a}_{1}}\,\,\cos {{\alpha }_{1}}=600\,\cos 30{}^\circ =519.615\,\,\text{m/s}$ ${{v}_{w\,2}}=0,\,\,u=300\,\,\text{m/s}$ Power output per kg/s of gas flow, $P=\frac{{{v}_{w\,1}}\times u}{{{10}^{3}}}=\frac{519.615\times 300}{{{10}^{3}}}=155.9=156\,\,k\,W$