The radiator of a steam system has a volume of 20 l and is filled with superheated water vapor at 200 kpa and 150 oc. at t = 0, both the inlet and outlet valves to the radiator are closed. after a while the temperature of the steam drops to 40 oc as a result of heat transfer to the room air. determine the entropy change of the steam during this process.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

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