Amount of absorption in a tray tower. an existing tower contains the equivalent of 3.0 theoretical trays and is being used to absorb so2 from air by pure water at 293 k and 1.013 x 10 5 pa. the entering gas contains 20 mol % so, and the inlet air flow rate is 150 kg inert air/h m2. the entering water rate is 6000 kg/h - m 2. calculate the outlet composition of the gas. (hint: this is a trial-and-error solution. assume an composition of, say, y, = 0.01. plot the operating line and determine the number of theoretical trays needed. if this number is not 3.0 trays, assume another value of y 1, and so outlet gas on.)

On a average work day more than work place firs are reorted

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.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false