Chemical Engineering Answers

Water is used to simulate the flow characteristics of oil in an industrial pipeline. The diameter of the test pipeline is 1/10th of that of the industrial pipeline. The viscosities of water and oil are 3.0 x10-4 and 2.9 x 10-2 N.s/m2 while their densities are 1000 and 1720 kg/m3 respectively. If the water velocity in the test pipeline is 10m/s, what is the corresponding oil velocity in the industrial pipeline? 

For an air(A)-water vapour(B) mixture, the partial pressure of the air is 5 pa and the total pressure of the system is 15 pa. The absolute humidity in mass of air/mass of water vapour is

In the context of mass transfer, what happened when tie line coincides with the operating line

a) Minimum no of plates are required. b) Maximum number of plates are required.

c) Optimum no of plates are required.

d) No plates are required.

The solubility of a gaseous substance A(molecular weight 26) in water is given by Henry’s law: pA=105xA ., pA in mm Hg. Convert the equilibrium relation to the following forms, a) yA=m.xA ., if the total pressure is 10 bar; (b) pA=m’CA ,CA in gmol/litre. Also write down the equilibrium relation using the mole ratio unit.

The breathing process within the lungs involves

(a) Diffusion of A through non-diffing (b)Equimolar Counter diffusion

(c) Multicomponent non-equimolar counter diffusion         (d) Not related to diffusion phenomenon.

One thousand kilograms per hour of a mixture of benzene (B) and Toluene (T) containing 60% benzene by mass is separated by distillation into two fractions. The mass flowrate of the benzene (B) in the top stream is 500 kg (B) /h and that of toluene in the bottom stream is 485 kg (T) / h. The unit operates at steady state.

3.1.1. Draw a schematic diagram showing all the relevant streams in the distillation unit. (8)

3.1.2. Write the basis for calculation.

Evaluate∫∫R r²drdθ over the region R between the circles r = asinθ and r = 2asinθ

Solve ∫y=0 ^ 1 ∫x=y^ 2 ^ 1∫z=0 ^ 1-x x dzdxdy

Solve (2y³xe^y+ y² + y)dx + (y³x²e^y-xy- 2x)dy = 0.

Solve dy/dx= 4x² (y-x)² + if y /x is a particular solution.