'
What is the oldest machine?
A.) The Antikythera Mechanism
B.) Tractor
C.) A MILL
D.) A WIND-MILL

Fluids at rest possess no flow energy. a)- true b)- false

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.

The process in which the system pressure remain constant is called a)-isobaric b)-isochoric c)-isolated d)-isothermal