Download GTU BE/B.Tech 2018 Winter 3rd Sem Old 130504 Process Calculation Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (OLD) EXAMINATION — WINTER 2018

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Q.1 Define and explain the terms:-Normality, Molality, Molarity. [07]

2. Q.2 In a double effect evaporator plant, the second effect is maintained under vacuum of 345 torr. Find the absolute pressure in kgf/cm² , kPa, atm, N/m² , bar, psi and mm Hg. [07]

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3. Q.3 Classify the material balance. [07]

4. Q.4 An aqueous solution of sodium chloride is prepared by dissolving 25 kg of sodium chloride in 100 kg of water. Determine (a) weight % and (b) mole % composition of solution. [07]

   OR

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   Explain the material balance of extractor. [07]

5. Q.5 Define and explain the terms:- Raoult’s Law, Dalton’s Law [07]

6. Q.3 Explain the material balance of crystallizer. [07]

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   OR

   Explain: (1) Watson equation and (i1) Riedel equation. [07]

7. Q4 With a neat sketch show the material balance for the following unit operation: (1) distillation (ii) evaporation. [07]

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8. Q4 Explain standard heat of reaction and standard heat of combustion. [07]

9. Q.5 Discuss the importance of recycling, bypassing and purge operation. [07]

   OR

   Explain importance of process flow sheet in Chemical Engineering Industry with a typical example. [07]

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10. Q.5 A weight of 1.10 kg of carbon dioxide occupies a volume of 33 liter at 300 K. Using the Van der Waals equations of state, calculate the pressure. Data: For CO₂, take a = 3.60 [(m⁶)? .kPa]/(kmol)²and b = 4.3 x 10^-5 m³/kmol. [07]

11. Q.1 Write a short note on Orsat analysis. [07]

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12. Q.2 Why excess air is provided for combustion process? [07]

    OR

    Discuss Proximate and Ultimate analysis of coal. [07]

13. Q.3 A gas mixture has the following composition by volume: Ethylene: 35.6%, Benzene: 24.5%, Oxygen: 1.3%, Methane: 15.5%, Ethane 20.0%, Nitrogen: 3.1%. Find: (a) the average molar mass of the gas mixture, (b) the composition by mass and (c) the density of gas mixture in kg/m3 at NTP. [07]

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