Q1) The pressure in an air tank is able to support a water column 15 meter high. Find the absolute air pressure in (PSI) if the local atmospheric pressure is 101 kPa. Take the density of water to be 1000 kg/m3.
Q2) A 10 m3 tank contains Oxygen (32 kg/kmol) at 7 bar and 33 C. How many cylinders could be filled from this tank if the cylinder capacity is 300 liter each? The initial pressure inside each cylinder is 0.5 bar and the required cylinder pressure after filling is 2 bar. Assume that the filling process is isothermal.
Q3) A piston-cylinder device contains steam (water vapor) at 3.5 MPa, and 300 °C. Initially, the volume of steam is 0.24 m3. Steam is cooled at constant pressure until it becomes dry saturated vapor. The piston is held in its position and the cooling continues until the cylinder contains water at 220°C. Draw the P- v diagram and determine (a) the mass of steam, (b) the properties of steam at the final state, and (c) the total heat rejected in MJ.
Q4) A 10 m3 tank contains Oxygen (32 kg/kmol) at 7 bar and 33 C. How many cylinders could be filled from this tank if the cylinder capacity is 300 liter each? The initial pressure inside each cylinder is 0.5 bar and the required cylinder pressure after filling is 2 bar. Assume that the filling process is isothermal.