2. A converging duct is supplied by a gas (R=2078 J/kg. K & γ = 1.3). Determine Mach number at one section of 10 cm2 area where the pressure and temperature are 100 kPa and 15 oC while gas flows at 300 m/s. Assuming one-dimensional isentropic flow, find Mach number, pressure, area and velocity at exit of the duct where the gas has a temperature of -10 oC.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.