Saturated steam enters a converging-diverging nozzle at 1.75 MPa, 10 percent moisture, and negligible velocity, and it

Question:

Saturated steam enters a converging-diverging nozzle at 1.75 MPa, 10 percent moisture, and negligible velocity, and it exits at 1.2 MPa. For a nozzle exit area of 25 cm2, determine the throat area, exit velocity, mass flow rate, and exit Mach number if the nozzle
(a) Is isentropic and
(b) Has an efficiency of 92 percent.