THE PROJECT IS PROUDLY SPONSORED BY :
GJS INTELLECTUAL COMPANY AUSTRALIA (www.kangchuentat.com)
PO BOX 6263, DANDENONG, VICTORIA VIC 3175, AUSTRALIA.
Mobile / SMS : +61-(0)405421706 E-mail : [email protected]
ONLINE QUIZ FOR CHEMICAL ENGINEERING FOR UNIVERSITY DEGREE STUDENTS
THEORETICAL EXAMINATION / PRACTICAL EXAM
Official Version
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CAUTION
PLEASE DO NOT REVEAL YOUR ANSWER TO ANYBODY. COPYRIGHT RESERVED 2009. NO PART OF THIS QUIZ SHOULD BE USED IN OCCASION OTHER THAN THIS ONLINE COMPETITION.
REGULATION –
ONLINE QUIZ FOR CHEMICAL AND BIOCHEMICAL ENGINEERING
Introduction
1. The International Online Quiz for Chemical and Biochemical Engineering for university students is open for all registered students studying at approved universities, colleges, chemical and biochemical engineering department of the institution of higher learning.
2. The participants have to answer all the questions of this website consist of Part One : Theoretical Examination that take time of 3 hour whereas the Part Two : Practical Exam that will consume ½ hour. However, participants are allowed to print copies of this quiz for your own research.
Registration Procedures
There is no formal registration procedure. Should any problems and confusion exist, please send your message -
To : Coordinator of Chemical Engineering Quiz (International Level),
GJS Intellectual Company Australia ,
PO Box 6263 , Dandenong , Victoria VIC 3175, Australia .
Mobile : +61-(0)405421706 E-mail : [email protected]
Participating Procedures
This quiz is open throughout the year using this webpage. The quiz should be conducted using computer equipped with Internet Explorer or Netscape and Excel program to facilitate calculations. Answer all questions of this webpage correctly.
Marking Procedures
All answers are kept confidential. The answers submitted via this form will be mark on computer in comparison to the standard answer. Only those answer at least 80% correct will be notified with congratulation e-mail. All complaints regarding the quiz sample answer will be required to accompany with United States Dollar Ten (USD$10) sent to the address above.
Awards for Winners
Only those who are able to perform 80 percent correct from al the answers provided will be awarded percipating certificates and cash prize of United States Dollar Ten (USD$10) per successful participant. The name of the winner will be recorded on this website for future reference.
PART A : OBJECTIVE QUESTIONS 1-6 [22 marks]
Choose from selection A – E the best answers for each questions stated :
SECTION ONE : MATERIAL SCIENCE FOR CHEMICAL ENGINEERS [4 marks]
In crystal material, hexagonal crystal system could form 4-digit index in certain direction of solid. For [1(-1)0] direction in the hexagonal crystal systems of particular catalyst applied in fume removal of incinerator, what is the four-digit index for this direction? Hint : The transformation equations between the 3-digit [h'k'l'] and the 4-digit [hkil] indices are :
h = 1/3 (2h' – k') i = - (h + k)
k = 1/3 (2k' – h') l = l'
[(-1)100] [1(-1)00] [(-1)000] [00(-1)(-1)] [(-1)0(-1)0]
SECTION TWO : GENERAL CHEMISTRY [4 marks]
Seawater (SW) is 3 wt% NaCl salt concentration. It is fed to a tank containing electrodes at a rate of 1000 gal / min. Calculate the hydrogen evolution rate with unit of lb / min. The information below will be helpful :
1 gal is equal to 0.1387 ft3
1 ft3 is equal to 62.43 lb
1 mol of NaCl generates 0.5 mol of H2
1 lb-mol = 1 lb-mass / ( molecular weight 1.0)
Assume H is contributed only by water H2O
4.4788 lbmol / min 4.4337 lb / s 3.3333 kg / s 5.5566 lbmol / min 3.3322 lbmol / min
SECTION THREE : ENGINEERING THERMODYNAMICS [4 marks]
Use the standard heat of formation and standard entropies to calculate ΔG° for the reaction :
N2 (g) + 3H2 (g) → 2NH3 (g)
at 25.0°C and 1 atm partial pressure of each gas.
Data of standard heat of formation, ΔHf° (kJ / mol) :
NH3 : -46.11
Data for standard entropies, S° [ J / (K·mol) ] :
N2 : 191.5 , H2 : 130.68 , NH3 : 192.3
Formula : ΔGº = ΔHº - TΔSº
-39.02 kJ -44.55 kcal 112.55 kJ 123 kcal -32.91 kJ
SECTION FOUR : CHEMICAL PROCESS UNIT OPERATIONS [2 marks]
Which of the sequence below represent a feasible flows of ethanol processing plants using cellulose as starting material ?
raw material → heat exchanger → distillation column → reactor
reactor → distillation column → raw material → heat exchanger
heat exchanger → raw material →distillation column → reactor
raw material → heat exchanger→ reactor → distillation column
distillation column → raw material → reactor → heat exchanger
SECTION FIVE : CHEMICAL ENGINEERING MASS TRANSFER [4 marks]
Calculate the maximum rate of uptake of glucose, J, to a sperical bacterium of diameter D, 1 µm (=10-6 m). Take the molecular diffusion coefficient of glucose, d, in aqueous solution to be 6 x 10-10 m2s-1. The reference formulae are :
Sh = kD / d
J = πD2k (100)
where D is diameter, k is constant or mass transfer coefficient (in ms-1), Sh is Sherwood number as constant, π = 3.142
3.7704 x 10-13 kgs-1 5,4342 kgs-1 9.801 x 10-14 kgmin-1
4.3278 x 10-18 gs-1 3.222 x 10-25 kgs-1
SECTION SIX : CHEMICAL ENGINEERING HEAT TRANSFER [4 marks]
Air flows at 0.002 kg / s though a 15 mm diameter, d, tube of length 1.2 m. The tube's wall is maintained at 100°C and the air's inlet temperature, Tin, is 25°C. Using the Dittus-Boeller correlation (Nu = 0.023 Re0.8 Pr 0.4), where Nu, Re and Pr are constants, calculate the heat transfer coefficient, h, in unit Wm-2K-1. data for air (assume constant) :
Cp = 1005 J kg-1K-1
M = 1.8 x 10-5 Pa·s
Pr = 0.74
λ = µCp / Pr, the unit for µ, Cp and Pr are as above.
Additional data :
Total mass flow rate = w = πd2vρ / 4
Re = ρvd / µ
h = Nu · λ / d, where d is diameter of tube, ρ is density of air, v is velocity of air. Please note that ρv = w / A, where A is the area of cylinder in this case, A = πd2 / 4 and π = 3.142
65.3 Wm-2K-1 32.22 kWm-2K-1 50.3 Wm-2K-1 32.3 Wm-2K-1 23.7 Wm-2ºC-1
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PART B: MULTIPLE ALTERNATIVE QUESTIONS 7-8 [18 marks]
Fill in the blanks below with appropriate answers :
SECTION SEVEN : CHEMICAL ENERGY BALANCE [5 marks]
Please match the term A-E below with the stated definition :
A. Yield C. Relative saturation E. Absolute saturation
B. Selectivity D. Molal saturation
i. Answer :
(moles of desired product formed) /
(moles that would have been formed if there were no side reactions and the limiting
reactant has reacted completely)
ii. Answer :
(moles of desired product formed) / (moles of undesired product formed)
iii. Answer :
(relative humidity 40% means partial pressure of water vapour equals 4/10 of the
vapour pressure of water at the system temperature)
iv. Answer :
(moles of vapour) / (moles of vapour dry gas)
v. Answer :
(mass of vapour) / (mass of dry gas)
SECTION EIGHT : BIOTECHNOLOGICAL ENGINEERING [13 marks]
The diagram below represents a flow diagram of the process to produce chymosin by fermentation. Use the list given, fit in appropriate operations, input and outputs at the marked [(i)-(xiii)] positions to complete the diagram :
sterile filtration preservatives sterile enzyme concentrate
fermentation biomass water (permeate)
medium blending filtration killing agent
killing organisms ultrafiltration medium sterilization
product formulation concentrated enzyme solution
medium ingredients
↓
(i)
--------------------------
(ii)
(iii)
(iv) ← (vi)
-------------------------- --------------------------
(vii) ← (v)
cell-free medium
(ix) ← (viii)
(xi) ← (x)
(xii)
(xiii)
PART C : SUBJECTIVE QUESTIONS 9 – 14 [50 marks]
Answers the questions below using the column provided in the space below :
SECTION NINE : CHEMICAL FLUID MECHANICS [ 9 marks ]
For the free surface waves in fluid mechanics, calculate and plot the propagation speed of isolated waves for depths from 10 mm to 10 km. Comment on the significance of the propagation speed for the average ocean depth of 4 km. Use the formula c = ±(gy)1/2 where c is the propagation speed, g is gravitational constant and y is water depth. The plot should be a straight line. Attached graph should be attached in separate e-mail to [email protected].
SECTION TEN : CHEMICAL REACTION ENGINEERING [8 marks]
The first order isomerization A → B is being carried out isothermally in a batch reactor on a catalyst that is decaying as a result of aging. Derive an equation for conversion X as a function of time by using the equations below :
Design equation : Nao dx / dt = -r'w
Reaction rate law : -ra' = k'a(t) CA
Stoichiometry : CA = CAO (1-X) = NAO (1-X) / V
Decay Law a(t) = 1 / (1+kot)
SECTION ELEVEN : BIOCHEMICAL REACTION ENGINEERING [10 marks]
Determine the Michaelis-Menten parameters, Vmax and Km for the reaction :
k1
→ k3
Urea + urease [ urease•urea ] → 2NH3 + CO2 + urease
← -H2O
k2
Curea (kmol /m3)
0.2
0.02
0.01
0.005
0.002
-rurea (kmol/m3•s)
1.08
0.55
0.38
0.09
Reference formula :
1 / (-rs) = [ (S + Km) / (VmaxS) ] = 1 / Vmax + Km / (Vmax•S)
1 / (-rurea) = 1 / Vmax + Km / (Vmax•Curea)
SECTION TWELVE : CHEMICAL MATERIAL BALANCE [9 marks]
One hundred and fifty kilograms of a saturated aqueous solution of AgNO3 at 100 °C is cooled to 20 °C in crystallizer, thereby forming AgNO3 crystals, which are filtered from the remaining solution in filter. The wet filter cake, which contains 80% solid crystals and 20% saturated solution by mass, passes to a dryer in which the remaining water is vapourized. Calculate the fraction of the AgNO3 in the feed stream eventually recovered as dry crystals and the amount of water that must be removed in the drying stage. Assume no changes in chemical properties of the substances and no loss, loss or leak of chemicals in unit operations.
SECTION THIRTEEN : CHEMICAL PROCESS CONTROL [4 marks]
Design a simple 1,3-propanediol processing plant using ethylene oxide and hydrogen gas as raw materials. The unit operations below should be used in the design of plant with at least one feedforward and one feedback controller :
REACTOR CONTROLLER DISTILLATION COLUMN HEATER
SECTION FOURTEEN : ECONOMY FOR ENGINEERS [10 marks]
An ethylene plant of 1000 – t annual plant capacity APC operating 80 percent of the calendar year ( 1 year = 365 days ) consumes propane raw feed at a cost RMu of $0.15 per pound of ethylene and incur labour cost for 30 plant operators per 8-hr shift at a median wage AWH of $18 per hour. Management overhead carries 0.9 exponential of total annual wages AW. Maintenance cost MC is assumed at 3 percent of annualized capital cost of $200,000. Steam consumption is 0.1 ft3 / lb of ethylene and is imported at $1.24 per cubic foot. Electricity consumption is 5 W / 100 lb of ethylene is bought at $0.05 per watt. Annual fuel import is 5000 ft3 of natural gas at a cost of $0.10 per cubic foot; environmental cleanup cost EC $0.05 per pound of ethylene ; office supplies cost OS is $0.02 per pound of ethylene; and annual contingencies cost ACC is $0.05 per pound of ethylene. Calculate the annual cost of (a) raw material, RM = RMu + APC, where 1-t is equal to 2240 lb; (b) labour cost, LC = AW + AWm, where AWm is management overhead with exponential m; (c) utility cost UC = UCF + UCF + UCS + UCE, where UCF is utility fuel cost, UCS is utility cost for steam and UCE is utility cost for electricity; (d) other operating cost like maintenance cost, MC; environmental cleanup cost, EC; office supply cost, OS and annual contingencies cost, ACC; (e) grand total of annual operating cost, AOC = RM + LC + MC + UC + EC + OS + ACC
PRACTICAL SECTION : [10 marks]
The tasks in this section should be performed in computer laboratory with Excel Program. Please submit a copy of spreadsheet after writing the Excel steps and functions in the column provided below :
In one of the ecological modelling of the concentration of sodium salt C in the wastewater plant at time t, it was found that the correlation of the concentration, C and time of effluent flow, t, measures at two different days, form graphs with the the equations below :
C = t4 + 1.5t3 + 2t2 – 3.5 Day 1
C = 3t2 – 5t + 3 Day 2
Using the computer program provided, calculate the value of t, the time required to achieve a concentration t in order to ensure the effluent meet the requirement of Environmental Office.
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