Asample consisting of 0.iomol of pe rfect gas molecules is held by a piston inside a cylinder such that the volume is l.25dm3> the external pressure is constant at l .oo bar and the tempe rature is maintained at 300 kb)'a thermostat. the piston is released so that the gas can expand. calculate (a) the volume of the gas when the exp ansion is complete; (b) the work done when the gas expands; (c) the heat absorbed by the system. hence calculate

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

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way