The thevenin equivalent impedance is the impedance looking from:

(a) the source with the output shorted.
(b) the source with the output open.
(c) any two specified open terminals with all sources replaced by their internal impedances.
(d) any two specified open terminals with all sources replaced by a short.

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.