Dry air enters a device operating at steady state at 25oc, 2 bar with a volumetric flow rate of 300 m3/min. liquid water is injected and moist air stream exists at 15oc, 2 bar and 85% relative humidity.
ignore the heat transfer between the device and its surrounding and neglect kinetic and potential energy effects. determine

(a) the mass flow rate at the exit, in kg/min.

(b) the temperature, in oc, of the liquid water injected into the air stream.

c) now assume that heat transfer occurs from the device to its surrounding at a rate equal to 20 kw. determine the temperature, in oc, of the liquid water injected into the air stream.

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.