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SamplesofCompetitiveExaminationQuestions:PartXXXXXI

TechnicalReport·July2016

DOI:10.13140/RG.2.1.3124.3761

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نماذج أسئلة اإلمتحان التنافسي علي إبراھیم الموسوي

0صفحة

2016

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راهود

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إاد إا اي

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ت ارا ن اا أ )ا

درا ات اا وا )واراه

ا وا ا د أن أر.

إا اي

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إا اي

Ali Ibrahim Al-Mosawi Ali I.Al-Mosawi

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------------------------------- االسم :

--------------------- الرقم السري

----------------الرقم السري

Part One: Choose the correct answer of the following: (60% , 3 marks per each question)

1. The average molecular weight of a gas mixture 16% O2 , 4% CO , 17% CO2 , & 63% N2 by weight is :

a) 28.5 b) 29.5 c) 30.5 d) 31.5

2. The mass fraction of 0.5 molar aqueous solution of H2SO4 (Sp. Gr. 1.03) is :

a) 0.038 b) 0.048 c) 0.058 d) 0.068 3. The heat duty (q) in kw of a heat exchanger to cool 50 m3/h oil (Sp. Gr. =0.9 & Cp= 2 kJ/kg.K) from 120 oC to 40 oC is about :

a) 500 b) 1000 c) 1500 d) 2000 4. The heat duty (q) in kw of a heat exchanger consuming 810 m3/h steam at 10 bar and 150 oC (ΔHv=2400 kJ/kg) is about:

a) 105 b) 106 c) 107 d) 108

5. Information on a name plate of a pump, 20 m3/h and 50 m head. The expected pump power is about:

a) 1 kw b) 2 kw c) 3 kw d) 4 kw 6. The kinematic viscosity of water in units m2/s is equal to :

a) 1 b) 10-3 c) 10-6 d) 10-9 7. The settling velocity of Stokes law depends on particle diameter as :

a) dp0.5 b) dp c) dp

2 d) dp3

8. A packed bed column of 1.13 m diameter, contains sand (bulk density ρB=1000 kg/m3 ) and 1 m height, fluidized with flowing fluid . the expected pressure drop of the column is about:

a) 5000 N/m2 b) 10000 N/m2 c) 15000 N/m2 d) 20000 N/m2 9. Which of the following processes is isolated system?

a) Adiabatic process b) Isobaric process c) Isothermal process d) Isochoric process

10. Which of the following is not a state function?

a) Internal energy b) Enthalpy c) Work d) Free energy

Ministry of Higher Education & Scientific Research Tikrit University College of Engineering Dept.: Chemical Engineering

MSC QUALIFICATION EXAM 2015-2016

Time: 3 Hours Date : 13 / 8 / 2015

1

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11. Which of the following processes is Non-equimolar counter diffusion of gases

a) At different number of moles of the gases diffusing counter-current to each other. b) An equal number of moles of the gases diffusing counter-current to each other. c) If the gas is diffusing through the stagnant film.

12. Which of the following separation processes is required the heat

a) Absorption b) Leaching c) Distillation d) Extraction 13. Which of the following is true:

a) The measurement element is used for controlling the output variable. b) The controller is used for actuating the load variable. c) The control valve is used for regulating the manipulating variable. d) The transmitter is used for regulating the control variable.

14. The Response of a control system for a change in load variable is called

a) Cascade b) Servo c) Regulator d) Frequency

15. Two parallel black plates 0.5 by 1.0 m. One plate is maintained at 1000 ºC and the other at 500 ºC. What is the net radiant heat exchange between the two plates?

16. An outside wall of a building consists of 0.1m layer of common brick [k=0.69 W/m.K] and 25mm layer of fiber glass [k=0.05 W/m.K]. The heat flow with through the wall for a 45°C temperature differences will be

17. Which of the following reactors can give the maximum gas conversion?

a) Fixed bed reactor b) Fluidised bed reactor c) Semi-fluidised bed reactor d) Plug-flow catalytic reactor

18. For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases by

a) 8 times b) 16 times c) 32 times d) 64 times 19. One of the most typical diesel additives that should be added to improve the performance of diesel fuel is

a) Solvents b) Anti-oxidation c) CCD d) Heptane 20. A petroleum fraction has API of 33.5, the density of such fraction will be

a) 0.7763 g/cm3 b) 0.6754 g/cm3 c) 0.9123 g/cm3 d) 0.8575 g/cm3

a) 8.97 W b) 18.33 W c) 120 W d) 515 W

a) 11.87 W/m2 b) 33.67 W/m2 c) 69.78 W/m2 d) 87.56 W/m2

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Part Two: Answer the following questions : (40% , 4 marks per each question)

1.

2.

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3. Find the pressure drop (P1-P2) for the following manometer arrangement and information : Water fluid SG=1 manometer fluid SG = 1.15, L = 75 mm, h = 150 mm, θ = 30 o

4. What are the most important factors effect the rate of filtration, and write the main equation relating these factors?

5. For a water at 350 K and 1 bar, the isothermal compressibility “κ” = 50x10-6 bar-1 . To what pressure must water be compressed at 350 K to change its density by 0.5 if the temperature is constant?

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6. Hydrochloric acid (A) diffuses through a thin film of water (B) 4.0 mm thick at 283 K. The concentration of HCl at point 1 on one boundary of the film is 12 wt% and on the other boundary, at point 2 is 4 wt%. The diffusivity of HCl in water is 2.5 x 10-9 m2/s. Calculate the flux of HCl considering water to be stagnant. Density of the solutions at points 1 and 2 are 1060.7 kg/m3 and 1020.15 kg/m3 respectively.(The Molecular weight of HCl= 36.5) 7. List the basic mode of controller and give its output equation. 8. What is the order of the decomposition of N2O?, and find the rate constant and half-life. N2O, mol/dm3 (103) 100 61 37 10 Time, s 0 50 100 230

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9. A thick-walled tube of stainless steel (k = 19 W/m.ºC) with 2 cm inner diameter (ID) and 4 cm outer diameter (OD) is covered with a 3 cm layer of asbestos insulation (k = 0.2 W/m.ºC) . If the inside wall temperature of the pipe is maintained at 600 ºC, calculate the heat loss per meter of length. Also calculate the tube insulation interface temperature.

10. What are the main products obtained by the vacuum distillation unit?

Asst. Prof. Zaid A. Abdel-Rahman Asst. Prof. Duraid Fadhil Ahmed

Head of Dept. : Dr. Aysar T. Jarullah

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