TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES MANILA
CHEMICAL ENGINEERING DEPARTMENT Pre- Board Examination
Chemical Engineering Principles 1. Refuse that has essentially unburnt fixed carbon is
a. wetted refuse b. coked refuse c. uncoked refuse
d. mixture of coke and uncoked
2. A certain manufacturing plant utilizes plenty of air in its operation. Ambient air passes through an adiabatic humidifier before being charge to the plant. The operation of an adiabatic humidifier is similar to
a. cooling tower b. spray chamber
c. coke packed dehumidifier d. gas absorber
3. In a PFFP the rate of washing is equal to ________ of the final filtration rate. a. 1/2
b. 1/4 c. 1 d. 2
4. In filtration operation involving incompressible cakes, the flow rate is directly proportional to a. viscosity of the filtrate
b. thickness of the filter cake c. the pressure applied d. the size of the cake particles
5. In PFFP the rate of filtration is directly proportional to the a. resistance of the filter cake
b. the cross section of the filter surface c. resistance of the filter medium d. viscosity of the filtrate
6. Equilibrium in crystallization process is reached when the solution is a. unsaturated
b. saturated c. supersaturated d. none of the above
7. The latent heat evolved when solid forms from solution and varies with both temperature and concentration is called a. heat of dilution
b. heat of vaporization c. heat of crystallization d. heat of fusion
8. Copra producers labeled their product as “dry” copra which means a. their product does not contain any moisture
b. their product contains very small amount of moisture c. their product contains equilibrium moisture
d. the weight of their product is the same as the bone dry weight
8. The temperature of a vapor-gas mixture as ordinarily determined by immersion of a thermometer in the mixture. a. wet bulb temp.
b. dew point temp. c. saturation temp. d. dry bulb temp. 9. Air conditioning involves
a. stripping b. humidification c. dehumidification d. evaporative cooling
10. The portion of water in the wet solid that cannot be removed by the air in its contact is called a. free moisture
b. final moisture
c. equilibrium moisture content d. critical free moisture
11. This type of drier is used for drying pasty materials such as wet filter cakes and lumpy solids. a. rotary drier
b. flash drier c. tray drier d. continuos drier
12. At the falling rate drying the rate at which moisture is removed from the solid material a. increase with time
b. decrease with time c. remains constant
d. no more drying takes place
13. A SWC is to be used to produce 1 ton/ h of copperas crystals by cooling of a sat’d solution which enters the crystallize at 120ºF. the slurry leaving the crystallize will be at 80ºF. cooling water enters the crystallize jacket at 60ºF and leaves at 70ºF. it may be assumed that U for the crystallization is 35. There are 3.5 ft2 of cooling surface per foot of crystallize length.
DATA:
Heat of solution = 4400 cal/ gmole Cp copperas = 0.7 BTU/ lb-ºF Solubility:
@ 120ºF = 140 parts copperas / 100 parts water 80ºF = 74 parts copperas / 100 parts water Calculate the cooling water required.
a. 52 gpm b. 50 gpm c. 60 gpm d. 45 gpm
14. A batch of 1000 kg of KCl is dissolved in sufficient water to make a sat’d solution @ 363 ºK, where the solubility is 35 w % KCl in water.the solution is cooled to 293 K which temp. The solubility is 25.4 w %. The weight of the crystal obtained if 5% of the original water evaporates on cooling is
a. 400 kg b. 238 kg c. 200 kg d. 480 kg
15. A plate and frame filter press is used to filter certain sludge for 2 h at constant pressure. Washing is done by using 10% of the filtrate collected. The time of washing is
a. 100 min b. 96 min c. 16 min d. 100 h
16. In the filtration of Al(OH)3 the following date were obtained 1. pump is operated at 50 psia
2. filtration was completed at constant pressure
3. the constant rate time is 15 min and 1/3 of the total volume is obtained during this period.
If only ½ of the original filtrate volume were collected with the area remaining the same, the filtration time is
a. 20.5 min c. 48.6 min
b. 24.4 min d. 38.3 min
17. The rate of reaction is not influenced by :
a. concentration of the reactants c. molecularity of the reaction
b. nature of reactants d. temperature
18. If the rate of reaction is independent of the concentration of the reactants, the reaction is said to be :
a. second order c. first order
b. zero order d. third order
20. The rate of formation of B in terms of rA (where rA = kCACB2 ) is
a. 2rA c. ½ rA
b. -½rA d. rA
a. mass action c. chemical equilibrium
b. constant temperature d. constant composition
22. The unit of k for a / second order elementary reaction is
a. 1 / time c. 1 / concentration
b. concentration / time d. (concentration ) –1 (time) –1 23. A reaction is known to be first order in A. A straight line will be obtained by plotting
a. 1 / CA versus time c. log CA versus reciprocal time
b. CA versus time d. log CA versus time
24. The activation energy of a reaction can be obtained from the slope of a plot of
a. k vs. log 1/T c. log k vs. 1/T
b. log k vs. T d. k vs. log T
25. The half life of a material undergoing second order decay is a. inversely proportional to initial concentration
b. proportional to the square of initial concentration c. independent of initial concentration
d. proportional to initial concentration
26. A certain reaction is first order in A. The special rate constant is 3 x 10 –3 /S. The half is
a. 231S c. 100S
b. 768 S d. 2.1 x 10 –3 S
27. A certain reaction has an activation energy is 125 kJ/mole. The rate constant is 0.033/ S at 550 C. The value of the special rate
constant at 1000 C is
a. 0.088 / S c. 1.3 x 10-4 / S
b. 8.3 / S d. 0.037 / S
28. A certain reaction has a special rate constant of 4.27 x 10-3 / S at 250C and 7.35 x 10-2 / S at 800C. The energy of activation is kJ
per mole is
a. 45.2 c. 104
b. 5.44 d. 860
29. The isothermal irreversible aqueous phase reaction A + B E at 1000F obeys dC
E / dt = rE = kCACB ; k = 15 ft3 / 1 lbmole-h.
Using a 1000 ft3 stirred tank reactor with an aqueous feed of 2000 ft3 / / h
1 the outlet concentrate of E if the inlet concentrate of A +
B are both 0.25 lbmole / ft3 is
a. 0.4233 lbmole / ft3 c. 0.1332 lbmole / ft3
b. 0.1223 lbmole / ft3 d. 0.3122 lbmole / ft3
30. The composition of the reaction component vary from position to position along the path of a / an
a. CFSTR c. batch reactor
b. adiabatic reactor d. plug flow reactor
31. The reacting substance follow one or more path to give different products
a. consecutive reaction c. parallel reaction
b. reversible reaction d. back mix reaction
32. The reactants are charged at the same time and concentration of solution varies with time
a. CFSTR c. batch reactor
b. plug flow reaction d. flow reactor
33. For saturated steam at 1 atm. condensing outside tube at 60 C, surface temperature I in degree Celcius is a. 60
b. 70 c. 80 d. 90
34. A property of solid which is indicated by the conventional scratch criteria and can be measured by indention a. friability
b. toughness c. hardness d. brittleness
35. It is the fraction of the radiation leaving from a surface that strikes to the other surface directly a. reflectivity
b. transmissivity c. absorptivity
d. view factor
36. At 100 C the gaseous reaction A B + C is observed to be first order. On starting with pure A, it is found that at the end of 10 minutes, the total pressure of the system is 176 mmHg and after a long time, the total pressure of the system is 270 mmHg. The half life of the reaction is
a. 10.65 min b. 0.65 min c. 11 min d. 10 min e. 10.5 min
37. What is the initial pressure of A in problem 36 a. 100 mmHg
b. 176 mmHg c. 0 mmHg d. 90 mmHg
38. Given a single horizontal oxidized steel pipe with an outer diameter of 1 in. and surface temperature of 180F. Determine the combined convective and
And radiation film coefficient ( BTU/h-ft-F) if the enclosed ambient temperature is 80 F a. 2.5
b. 2.25 c. 2.15 d. 2.07
A single effect evaporator is operating under the following conditions: Feed--- 40,000 lb/hr
Xf--- 5% solid Tf--- 200F Xp--- 45% solid
Separation temperature of the vapor going into condenser is 125 F. Specific heat of all solutions is 1 cal/gC. Overall heat transfer coefficient is
500 BTU/hr-ft.ft F. Assume no boiling point rise. 39. Calculate the rate of evaporation in pounds/hr
a. 40,000 b. 41,000 c. 35,000 d. 33,500
40. Heating area required in feet square a. 535 b. 353 c. 355 d. 550 41. Steam economy a. 1 b. 0.8 c. 0.9 d. 0.75
42. It is normally the first step in the treatment of waste water a. clarification
b. screening c. flotation d. comminution
43. A device used to move incompressible fluid a. blower
b. compressor c. pump d. fan
44. A porous material dries in the open air at a rate approximately proportional to its moisture content. If a sheet hangs in the wind loses half of it free moisture in the first hour, when will it have lost 99% with the weather conditions remaining the same?
a. 7.5 h b. 8.67h c. 6.67h d. 450 min.
45. A separation process wherein a liquid solvent is used to dissolve a soluble solid from an insoluble solid a. solvent extraction
b. absorption c. leaching d. adsorption
46. A distilling column is composed of 7 theoretical plates in the enriching section and 8 theoretical plates in the stripping section. The overall plate efficiency is 50%, then the actual number of plates is
a. 15 b. 30 c. 16 d. 32
47. The ease or difficulty of separating components by distillation is determined by the a. relative volatility
b. viscosity c. ]vapor pressure d. relative solubility
48. It is the Chemical Engineering Law
a. R. A. 381 c. R. A. 831
b. R. A. 318 d. R. A. 813
49. Who is the current PRC Commissioner
a. Alfonso Abad c. Antonietta Fortuna -Ibe
b. Hermogenes Pobre d. Avelina dela Rea-Tan
50. It is a juridical necessity to give, to do or not to do.
a. contract c. ethics
b. obligation d. responsibility
51. It is the meeting of mind between 2 parties.
a. contract c. ethics
b. obligation d. responsibility
52. It is the grant issued by the Philippine Government giving an inventor, maker or designer the right to exclude others from making, using or selling his invention, utility or design.
a. trademark c. patent
b. copyright d. trade names
53. The life of patent is
a. 17 c. lifetime
b. 20 d. 25
54. The life of trademark is
a. 17 c. lifetime
b. 20 d. 25
55. The Chairman of Board of Chemical Engineering is
a. Lauro Guevarra c. Rizalino Nocon
b. Francisco Avellano d. Lydia Tansinsin
56. It is a type of physical operation by which a desired step in an industrial process is controlled or conducted.
a. unit process c. chemical process
b. unit operation d. heating
57. The life of a copyright
a. 17 c. 20
b. 5 d. 50 years after death of the author
58. Creation of PRC
a. R.A. 223 c. R.A. 332
b. PD 223 d. PD 332
59. The chemical engineer shall uphold at all times the _________ of the chemical engineering profession and shall protect it from misinterpretation.
a. standards c. impartiality
60. A set of using, selling and making of the invention without the consent of the inventor.
a. infringement c. illegal use
b. pirating d. licensing
61. US Patents are protective in the Philippines.
a. false c. sometimes
b. true d. very true
62. Simplicity is a bar to n invention.
a. true c. sometimes
b. false d. maybe true
63. PRC means
a. Professional Regulatory Commission b. Professional Regulation Commission c. Professional Regulatory Command d. Professional Regulation Command 64. Necessity is the mother of __________.
a. utility model c. invention
b. industrial design d. trademark
65. The right over protest, trademark and copyright is
a. intellectual property right c. human right b. industrial property right d. industry right 66. It is also known as remedial law.
a. private law c. substantive law
b. public law d. procedural law
67. Which of the following is not a source of obligation.
a. Law c. Technical Specification
b. contract d. quasi-delites
68. It means birth of contract.
a. perfection of contract c. consummation of the contract b. compliance with the contract d. start of the contract
70. It includes word, name, symbol, sign or device or any combination thereof.
a. service mark c. goods
b. trademark d. IPO mark
71. Who has the right to a patent?
a. actual inventor c. assignees
b. inventors’ heirs d. all of the above
72. Patent and Trademark Laws were approved in the Philippines.
a. 1927 c. 1947
b. 1937 d. 1957
73. The chemical engineer shall ______________ to give credit to those to whom credit is properly due.
a. see to it c. endeavor at all times
NAME___________________________________________________________ Student Number_____________________SCORE________________________ A B C D A B C D 1. O O O O 41. O O O O 2. O O O O 42. O O O O 3. O O O O 43. O O O O 4. O O O O 44. O O O O 5. O O O O 45. O O O O 6. O O O O 46. O O O O 7. O O O O 47. O O O O 8. O O O O 48 . O O O O 9. O O O O 49. O O O O 10. O O O O 50. O O O O 11. O O O O 51. O O O O 12. O O O O 52. O O O O 13. O O O O 53. O O O O 14. O O O O 54. O O O O 15. O O O O 55. O O O O 16. O O O O 56. O O O O 17. O O O O 57. O O O O 18. O O O O 58. O O O O 19. O O O O 59. O O O O 20. O O O O 60. O O O O 21. O O O O 61. O O O O 22. O O O O 62. O O O O 23. O O O O 63. O O O O 24. O O O O 64. O O O O 25. O O O O 65. O O O O 26. O O O O 66. O O O O 27. O O O O 67. O O O O 28. O O O O 68. O O O O 29. O O O O 69. O O O O 30. O O O O 70. O O O O 31. O O O O 71. O O O O 32. O O O O 72. O O O O 33. O O O O 73. O O O O 34. O O O O 74. O O O O 35. O O O O 75. O O O O 36. O O O O 76. O O O O 37. O O O O 77. O O O O 38. O O O O 78. O O O O 39. O O O O 79. O O O O 40. O O O O 80. O O O O
