Chemical Engineering Answers

d²C/ dy²= [dC²/dȳ². (1/√(y)) + dC/dȳ .d/dȳ (1/√(y))]

please try to bring the equation a modified Bessel Equation of appropriate order. Identify the the order and write down the analytical solution for the concentration distribution C= f (ȳ) and thus C= f(z) using modified Bessel Functions.

The values are given if you need it.

reaction rate constant (k) =0.05 cm/s

Diffusion coefficient of ‘A’ (D) = 0.01 cm2/s

The cavity opening at the top (a)= 0.1 cm

Concentration of ‘A’ at z=0 (C₀)= 1 mol/cm3

Length (L)= 1 cm

Demonstrate( diagram and brief explanation ) Boolean algebra in a PLC context: use 2X1C’s and label them A,B. Show how you would achieve both or and in ladder logic

Demonstrate( diagram and brief explanation) how logic function MOV and ADD are represented in. PLC ladder logic context

An oil storage tank has 20mm steel walls covered with 50mm of fiber glass insulation. if the oil temperature is kept at 150 degree Celsius, what is the rate of heat loss when the outside temperature is 20 degree Celsius and external air coefficient is 20W/m². How much would the heat loss be reduced by doubling the thickness of the insulation?

A shell-and-tube heat exchanger has one pass on the shell side and two passes on the tube side (i.e.al-2shell and tube heat exchanger). It is being used for oil cooling. The oil flows in the tube side. It enters at 1120C and leaves at 78 0C The shell-and-tube fluid is water at a flow rate of1.35 kg/s, entering at 360C and leaving at 78 0C. The heat capacity of water is 4180j/(kg. K), and the overall heat transfer coefficient for the heat exchanger is 350 W/(m2.K). The geometry factor, F is 1.15. Determine the heat transfer area required for the unit.

A pipe of 6.5 cm outside diameter is covered with 5 cm (thickness) of asbestos layer

(conductivity = 0.12) and 4 cm (thickness) layer of cork (conductivity = 0.03). If the

temperature of outer surface of the pipe is 150 0 C and the temperature of the outer surface of

the cork is 35 0 C. Calculate the heat loss in W/m 0 C.

When doing a PLC project, there are 5 steps that are typically followed. Please list and describe these steps in your own words.

Using the PLC comparison table compare PLC’s from 2 different manufactures in term of support for IEC- 61131, communication protocols and redundancy. Try to explain what the advantage and disadvantage of the support would mean to you as an end consumer

A reaction between methanol and oxygen can be used to produce formaldehyde: 2𝐶𝐻3𝑂𝐻 + 𝑂2 (𝑔) → 2𝐻𝐶𝐻𝑂(𝑔) + 2𝐻2𝑂(𝑙): ∆𝐻̂𝑟 𝑜 = −326.2 𝑘𝐽/𝑚𝑜𝑙 The standard heat of combustion of hydrogen is: 𝐻2 (𝑔) + 1 2 𝑂2 (𝑔) → 𝐻2𝑂(𝑙): ∆𝐻̂𝑟 𝑜 = −285.8 𝑘𝐽/𝑚𝑜𝑙 (a) Use these heats of reaction and Hess’s law to determine the standard heat of the direct decomposition of methanol to form formaldehyde: 𝐶𝐻3𝑂𝐻(𝑙) → 𝐻𝐶𝐻𝑂(𝑔) + 𝐻2(𝑔)

A barite composed of 100% BaSO4 is fused with carbon in the form of coke containing 6% ash (which is infusible). The composition of the fusion mass is

BaSO4 11.1%

BaS 72.8

C 13.9

Ash 2.2

_____

100%

Reaction:

BaSO4 + 4C → BaS + 4CO

Find the excess reactant, the percentage of the excess reactant, and the degree of completion of the reaction.