MID-TERM TEST INTRODUCTION TO CHEMICAL ENGINEERINGAcademic Year 2014/2015 (21 October 2014)Lecture : Ir. Dewi Tristantini, MT., PhD.Time : 90 Minutes

Circle a letter for the right answer of each problem

1. Solid particles separation based on the difference in their flow velocities through fluids is termed as thea. Clarification c. Classificationb. Elutriation d. Sedimentation

2. Substances that categorized as raw materials in chemical product tree are...a. Rock, salt, solvent, dispenser d. Ethylene, propene, butadiene, benzeneb. Plastic, dyes, fertilizer, cosmetics e. Petroleum, natural gas, biomass, airc. Methanol, vinyl clhoride, styrene, acrylic acid

3. There are 5 periods of emergence and growth of Chemical Engineering, since 2000 until now, Chemical Engineering is in era of....a. Biotechnology revolution d. Pragmatic empiricism erab. Computation and process simulation e. Startup phasec. Mathematic era

4. Steam Kondensat P = 1,4 MPa ; P = 1,4 MPa ; T = 300 oC T = 150 oC

Air AirT = 40oC T= 20oC

Figure above is block flow diagram of...a. Compressor d. Membraneb. Pump e. Heat exchange c. Expander

5. To provides technical support to staff and troubleshoots processes in a production facility to keep a plant running efficiently and being invlolved with design work for improving methods of production is mainly the typical function of Chemical Engineer as....a. Environmental engineer d. Plant process engineerb. Bussiness coordinator e. Research and development engineerc. Sales and marketing engineer

6. To develop budgets and capital projections for a facility or process. Coordinate work closely with production and design team members to determine the exact needs of a

new process, then plan the capital needs necessarily to implement the program is mainly the typical function of Chemical Engineer as....a. Environmental engineer d. Plant process engineerb. Business coordinator e. Research and development engineerc. Sales and marketing engineer

7. To explore and develop new process and products and determines their usefulness and applicability is mainly the typical function of Chemical Engineer as....

a. Environmental engineer d. Plant process engineerb. Business coordinator e. Research and development engineerc. Sales and marketing engineer

8. Dimension for unit of pressure is....a. [L] d. [M]/([L][T]2)b. [L]/[T]2 e. [M][L]/[T]2

c. [M]/[L]3

9. The most common flow regimes in pipe which has characteristics chaotic, transverse motion, and unpredictable is called....

a. Laminar d. Steady stateb. Transitional e. Unsteady statec. Turbulent

10. System which does not have flows in or out of substance but still have energy of momentum flows is called as....

a. Open system d. Steady state systemb. Closed system e. No generation systemc. Isolated system

11. System does not accumulate a substance (accumulation = 0) is called as...a. Open system d. Steady state systemb. Closed system e. No generation systemc. Isolated system

12. System in which material is transferred across the system boundary, that is, enters the system, leaves the system, or both is called as....

a. Open system d. Steady state systemb. Closed system e. No generation systemc. Isolated system

13. Ratio of the moles of a particular (usually desired) product produced to the moles of another (usually desired or by-) product produced in a set of reactions is called as...

a. Limiting reactant d. Degree of completionb. Conversion e. yield

c. Selectivity

14. Equipment which is used to move liquid substance is....a. Compressor d. Valveb. Pump e. reactorc. Expander

15. Type of separation which uses solvent is...a. Distillation d. membraneb. Extraction e. filtrationc. Adsorption

16. Type of separation which uses heat input to evaporate the volatile component from other components is....

a. Distillation d. membraneb. Extraction e. filtrationc. Adsorption

17. The oldest chemical industry produces...a. Soap d. Carbon blackb. Sugar e. Synthetic fiberc. Pharmeutical

18. Product of oil distillation which has lowest boiling point is....a. Vacuum residue d. Gasolineb. Fuel oil e. LPGc. Kerosene

1 3

Figure for number 20 and 21.

19. Number 1 shows ....a. Process name d. Chemical reactionb. Reactant e. Operation unitc. Product

20. Number 3 shows ....a. Process name d. Chemical reactionb. Reactant e. Operation unitc. Product

2

21. Valves is unit operation for ....a. Separation process d. Transport process (movers)b. Mixing process e. Heat exchange processc. Reaction process

22. Method of separation which is commonly used in oil petroleum refinery is....a. Distillation d. Membrane b. Extraction e. Heat exchange process c. Adsorption

23. Alumunium sulfate can be made by reaction crushed bauxite ore with sulfuric acid, according to following reaction:

Al2O3 + H2SO4 Al2(SO4)3 + 3H2O

The bauxite ore contains 55,4% by weight of alumunium oxide, the remainder being impurities. The sulfuric acid solution contains 77,7% H2SO4, the rest being water. To produce crude alumunium sulfate containing 1798 lb of pure alumunium sulfate, 1080 lb of bauxite ore, and 2510 lb of sulfuric acid solution are used. What was the degree of completion of the reaction?a. 0.26 d. 0.89b. 0.29 e. 0.92c. 0.79

24. A wire is undergoing transverse vibration with a certain vibration period (T). Wire’s vibration period (T) has a dimension proportionality to the mass per unit length (μ), wire length (L), and wire’s tension force (F). find the equation of the wire’s vibration period (T) by using dimensional analysis!

a. T = k.L.μ.F d. T = kL

F μb. T = k.L. (μ/F)0.5 e. T = k.L2F-1

c. T = k.L.√ Fμ

25. The common method used in manufacturing sodium hypochlorite bleach is by the reaction:

Cl2 + 2NaOH NaCl + NaOCl + H2O

Chlorine gas is bubbled through an aqueous solution of sodium hydroxide, after which the desired product is separated from sodium chloride (a by-product of the reaction). A water-NaOH solution that contains 1145 lb of pure NaOH is reacted with 851 lb of gaseous chlorine. The NaOCl formed weighs 618 lb. What is the degree of completion of the reaction?a. 0.692 d. 0.685

b. 0.194 e. 0.758c. 0.579

26. A charcoal plant has a contract to make charcoal briquettes that are guaranteed to contain no more than 10% moisture and 10% ash. The raw material that they use has 1.4% moisture, 16.6% volatile material, 57.5% carbon, and 13.5% ash. To get the charcoal that meet specification, they mix raw material with petroleum coke which contain 8.2% volatile material, 88.7% carbon, and 3.1% moisture. How many petroleum cokes that must be added?

a. 20 kg d. 35 kgb. 25 kg e. 40 kgc. 30 kg

27. Which of the following is used as a catalyst in fluidisied bed catalytic cracking?a. Silica-magnesiab. Silica-aluminac. Bentonite claysd. All (a), (b) and (c)

28. In petroleum refining, the process used for conversion of hydrocarbons to aromatics isa. Catalytic crackingb. Catalytic reformingc. Hydrotreatingd. Alkylation

29. Octane number of gasoline is a measure of itsa. Resistance to knockb. Ignition delayc. Ignition temperatured. Smoke point

30. To accelerate the transition to a sustainable society is a mission of....a. Environment protection agencyb. Global warming preventionc. Natural stepsd. Economically development

31. Global warming is primarily a problem of too much ...... in the atmosphere---which acts as a blanket, trapping heat and warming the planet.

a. Carbon monoxide d. Carbon dioxideb. Nitrogen e. Oxygen

32. Catalyst used in catalytic reforming isa. Platinum on alumina

b. Nickelc. Irond. Aluminium chloride

33. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes.

a. Blood poisoningb. Anaemiac. Nervous system disorderd. All (a), (b) & (c).

34. Exposure to chemicals having carcinogenic properties causea. Dermatitis (skin disorder)b. Cancerc. Asphyxiation (suffocation)d. Asthma

35. Fertiliser plants get their N2 requirementsa. By fractionation of liquified air.b. By dissociating axides of nitrogen.c. From coal gas (coke oven gas).d. From producer gas.

36. The gasification reaction represent by, C +H2O = CO + H2, is a/an ________ reaction.a. Exothermic c. Endothermicb. Catalytic d. Autocatalytic

37. Valves is unit operation for...a. Separation process d. Transport process (movers)b. Mixing process e. Heat exchange processc. Reaction process

38. A catalyst...a. Initiates a reaction.b. Lowers the activation energy of reaction molecules.c. Is capable of reaction with any one of the reactants.d. Can not be recovered chemically unchanged at the end of a chemical reaction.

39. 6 Kg of carbon is burnt with an amount af air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant?

a. 100% c. 95%b. 75% d. 20%

40. Conversion __________ with increase in pressure for ammonia synthesis reaction i.e.,a. Increasesb. Decreasesc. Remains unchangedd. Unpredictable from the data

ESSAY Do the essay problems on the back side of the problem pages

1. Suppose you have a pipe that constricts halfway through form a radius of 0.5 cm to a radius of 0.25 cm. Previously, a liquid approaches at a velocity of 0.5 m/s. What is the velocity of the fluid after the constriction?

2. A mixture containing 45% benzene (B) and 55% toluene (T) by mass is fed to a distillation column. An overhead (top) stream of 95 wt% B is produced, and 8% of the benzene fed to the column leaves in the bottom stream. The feed rate is 2000kg/h. Determine the overhead flow rate and the mass flow rates of benzene and toluene in the bottom stream.

3. What is the volumetric flow rate of a solution with density 1.5 kg/m3 flowing at a velocity of 5 m/s and a mass flow of 500 g/min? What is the area of the pipe? If it is circular, what is the radius?

Molecular weight data:Al = 27, S = 32, O = 16, H = 1, Cl = 35.5, Na = 23 , C = 12