)state and explain 3 weld defects and 2 practices for each, to reduce such defect. (b) give 3 advantages and 2 disadvantages of friction stir welding and resistance welding (it should be a total of 5 items for each of the welding processes). (c) explain the impact of residual stresses in welded structures and how it can be minimized before welding operation

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.

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false