A low-pressure steam turbine expands steam from inlet conditions 7 psia, 300◦F to outlet conditions 3 psia, 175 O F. Model the steam as an ideal gas with  R = 85.83 ft lbf/lbm O R, c p = 0.44 Btu/lbm...

A low-pressure steam turbine expands steam from inlet conditions 7 psia, 300◦F to outlet conditions 3 psia, 175^OF. Model the steam as an ideal gas with
 R = 85.83 ft lbf/lbm^OR, c_p
= 0.44 Btu/lbm^OR, and calculate   a. Work per pound of steam flow.   b. Isentropic efficiency  . c. Polytropic efficiency.   d. Stage efficiency, assuming that the expansion is done in three stages of equal pressure ratio and stage efficiency