Air flows with stagnation temperature t=300 k. the flow is isentropic through a converging duct with exit area a2=0.20 m2·the nozzle exits into the atmosplere where pb=100 kpa determine: (a) the minimum stagnation pressure for choked flow (b) the mass flow rate given the stagnation pressure found in parta (c) the exit mach if p 160 kpa (d) the mass flow rate given po= 160 kpa (e) the value of a/a* given the exit mach from part o (f) explain why a/a* is greater than 1

To design a steam turbine to produce 12,000 hp power. a engineer comsiders using a steady state stean low st 1160fr and engineer considers using a steady state steam flow at 1160°r and 450 psia to drive this steam turbine. the exhaust of the steam is cooled by the lake (vacuum). heat losing to the surroundings is measured at a rate of 555.55 btu/s. (a) sketch the system with the given conditions. (b) neglecting kinetic and potential energy changes from inlet to exit, determine the volumetric flow rate of the steam at the inlet, (ft'/hr). must clearly show unit conversions at crtical terms.