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Posted By: sasi kala Member Level: Diamond Posted Date: 30 May 2008
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2007 Anna University B.E CH 241 — COMPUTER APPLICATIONS IN CHEMICAL ENGINEERING Question paper
B.E./B.Tech. DEGREE EXAMINATION,
Fourth Semester
Chemical Engineering
CH 241 — COMPUTER APPLICATIONS IN CHEMICAL ENGINEERING
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 ? 2 = 20 marks)
1. Distinguish between a binary system and hexadecimal system.
2. Explain the statements (a) LIST 10–30 (b) DELETE 20–40.
3. What is data retrieval?
4. What are property information systems?
5. Convert the following into decimal :
(a)
(b) .
6. Explain the use of DO–loop in FORTRAN.
7. What are data processing operations?
8. Write a basic program to calculate for different values of
x = 1 to 10.
9. Write the FORTRAN expression for .
10. What is an interface?
PART B — (5 ? 16 = 80 marks)
11. Write a FORTRAN program to calculate the pressure drop for a liquid flows in a pipe.
The steps for calculating the pressure drop are
(i) Calculating Reynolds number,
(ii) If
(1)
(2) HFS =
(3) .
(iii) If
(1)
(2) HFS =
(3) .
Where are density of the fluid, velocity of the fluid and diameter of pipe and is the viscosity of the fluid.
12. (a) (i) Calculate how much strap iron is needed to reduce 500 kg of stibnite to pure antimony as per the reaction
. (6)
(ii) Calculate the mass fraction and mole fraction of each component in the following mixture of hydrocarbons.
100g of , 100g of , 200g of . (5)
(iii) Calculate the molar volume and density of methane gas at 519.67?R and a pressure of 3.5 atm. (5)
Or
(b) (i) For the balanced reaction the rate of production of in a reactor operated at steady state is
6 moles/hr. What is the rate of consumption of ? (8)
(ii) A reformer produces carbon monoxide from methane by the reaction
The feed is 20 moles/hr containing 25 mole% methane. What is the flow rate of unreacted methane out of the reactor for the reaction rate given in (i)? (8)
13. (a) Find the equation for the best straight line through the following points using the method of least squares.
i
(mole/cm3)
(cm3/mole)
1 0.898 –291.1
2 0.937 –288.4
3 0.987 –289.4
4 1.046 –285.7
5 1.111 –283.5
6 1.188 –280.0
7 1.297 –277.2
8 1.414 –273.9
9 1.548 –268.6
10 1.692 –261.5
11 1.976 –254.0
12 2.257 –243.1
13 2.591 –231.0
Or
(b) The vapor pressure of liquid acetonitride ( ) at three temperatures is
i ( )
(mm Hg)
1 268.15 20
2 289.05 60
3 300.15 100
Estimate the vapor pressure at 280.85?K using (i) Linear interpretation (ii) Quadratic interpretation (iii) Compare the estimates with the experimental values of 40 mm Hg. (6 + 5 + 5)
14. (a) A pilot plant distillation column is used to strip ethyl alcohol from a feed stream Ethyl alcohol and water. Set up equations and determine the number of design variables for the distillation column when the feed rate, the distillate composition and bottom composition are specified.
Or
(b) (i) A stream of nitrogen gas (call it stream 1) contains 0.5 mole% water vapour. Determine the weight fraction of water. (8)
(ii) A stream of nitrogen gas contains 0.2 wt% water vapour. Determine the mole fraction of water. (8)
15. (a) A plant has four machines, each capable of producing three variations of a single product. The profits per hour when producing the three variations on the respective are given in the following table :
Profit (rupees per hour) for each variation by machine.
Machine
Variation 1 2 3 4
1 5 6 4 3
2 5 4 5 4
3 6 7 2 8
The production rates per hour of the four machines when producing the three variations of the product are given in the following table.
Production rate per hour for each machine by variation.
Variation Machine
1 2 3 4
1 8 2 4 9
2 7 6 6 3
3 4 8 5 2
The demand for the three variations during the next month is expected to the 700, 500 and 400 units of variants 1, 2 and 3 respectively. The maximum available hours to produce the three variations during the next production period on the four machines are 90, 75, 90 and 85 hours respectively. Find the optimal schedule and the respective maximum profit.
Or
(b) An automobile manufacturer is faced with the problem of determining the minimum cost policy for supplying dealers with the desired number of automobiles. The relevant data are given in the following table :
Transportation Data for automobile
Plant Dealer Plant capacity
1 2 3 4 5
1 1.2 1.7 1.6 1.8 2.4 300
2 1.8 1.5 2.2 1.2 1.6 400
3 1.5 1.4 1.2 1.5 1.0 100
Dealer Requirements 100 50 300 150 200
The value 2.2 represents the cost of shipping one car from plant 2 to dealer (Ware house) 3, Likewise, 2.4 represents the cost of shipping one car from plant 1 to dealer 5. Find the optimal solution.
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