a 400 l tank initially contains water at 200 kpa and a quality of 1%. heat is transferred to the tank by a burner, thereby raising the temperature and pressure of the water. at a pressure of 3 mpa, a valve opens and saturated vapor at 2 mpa flows out. the burner remains on, maintaining a pressure of 3 mpa inside the tank, until the quality of the tank is 90%, after which it shuts off