Engineering Answers

Crystals of Epsom salt having an equivalent diameter of 1.5 cm are growing in a solution of MgSO4 at a supersaturation of 0.005 mole fraction MgSO4.7H2O and a temperature of 303 K. For saturated solution of MgSO4, the average coefficient of interfacial reaction is 0.18 gmol/cm2.h.mole fraction. The mass transfer coefficient has been estimated to be 1.75 gmol/cm2.h.mole fraction. The average density of the crystals is 1.68 g/cm3. Assuming the crystals to be cubic, calculate their growth rate in cm/h.

A gaseous mixture of SO2 and air containing 4 % SO2 by volume is to be scrubbed counter currently with water in a packed absorption column having a cross sectional area of 0.90 m2. The inlet gas rate is 30 kmol/h of a gas mixture and liquid rate is 80 kmol/h of pure water. The operating temperature and pressure are 298 K and 1 atm respectively. SO2-water solution obeys Raoult’s law and the vapour pressure of SO2 at 298 K is 99.29 kPa. Overall absorption mass transfer coefficient based on gas phase is 72 kmol/h.m3.atm. Calculate: a. The actual to minimum liquid flowrate. b. Height of the column required for 95 % absorption of SO2 from the entering gas mixture during absorption process for 1.5 times of minimum used as actual liquid flowrate.

A ball is thrown so that it may just clear a wall 3.6 m high and at a distance of 4.8 m from the wall. The ball was found to hit the ground at a distance of 3.6 m on the other side of the wall. Find the least velocity with which the ball can be thrown.

16.) Find the dew point temperature of air whose humidity ratio is 0.0150 kg water/kg dry air. (PLEASE GIVE THE CORRECT ANSWER WITH FORMULA/SOLUTION)

Air in a conditioned space has 26 oC db and 70% RH, find the wet bulb depression. Please give me the correct answer with formula/solution.

A zero-order homogeneous gas reaction with stoichiometry A→rR proceeds in a constant volume bomb,n=1 when t=0 and n=1.5 when t=1. If the same reaction, same feed composition and initial pressure proceeds in a constant-pressure set-up, find V at t=1 if V=1 at t=0.

The current selected programming language is C. we emphasize the submission of a fully working code over partially correct but efficient code. Once submitted you cannot review this problem again. You can use printf() to debug your code. The printf() may not work in the case of syntax/runtime error. The version of GCC being used is 5.5.0.

There are 400kf/min of water being handled by a pump. The lift us firm 20-m deep well and the delivery velocity ks 15m/s. Find (a) the change in potential energy, (b) kinetic energy, (c) the required power of the pumping unit; g= 9.81m/s²

find that at what distance body A will attain a velocity of 3 m/s. when starts from rest. Assume coefficient. of friction as 0.2 for block and surface and pulleys are frictionless and weightless.

The thin-walled single cell beam shown in Figure has been idealized into a combination of

direct stress carrying booms and shear stress only carrying walls. If the section supports a vertical

shear load of 20 kN acting in a vertical plane through booms 3 and 6, calculate the distribution of

direct stress around the section.