PTU B.Tech Petroleum Engineering 4th Semester May 2019 72427 CHEMICAL ENGINEERING THERMODYNAMICS Question Papers

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Roll No.

Total No. of Questions : 09

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Total No. of Pages : 02

(Sem.-4)

B.Tech.(Petroleum Refinary Engineering) (2013 Batch)

CHEMICAL ENGINEERING THERMODYNAMICS

Subject Code : BTPC-404/BTCH-305

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M.Code: 72427

Time: 3 Hrs.

Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

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2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Answer briefly :
   1. Find the density of nitrogen gas at NTP.
   2. State 2nd law of thermodynamics.

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   3. What is throttling process? Give an example.
   4. What is the significance of H-x diagram?
   5. What do you understand by dew point and bubble point?
   6. What is the physical significance of partial molar properties?
   7. Define equilibrium constant. What is its significance?

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   8. What is the effect of pressure on equilibrium constant in a gas phase reaction?
   9. Write two major applications of Gibb's Duhem equation.
   10. What do you understand by theoretical flame temperature?

SECTION-B

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2. Calculate AU and AH in kJ for 1 kmol water, as it is vaporized at a constant temperature of 373 K and constant pressure of 101.3 kPa. The specific volumes of liquid and vapour at these conditions are 1.04 × 10^-3 and 1.675 m³/kmol respectively; 1030 kJ of heat is added to water for this change.
3. Write the Clapeyron equation and hence find the melting point of mercury at 10 bar, where mercury has a density of 13.69 × 10³ kg/m³ in the liquid state and 14.193 × 10³ kg/m³ in the solid state, both measured at the melting point of 234.33 K and 1 bar. Heat of fusion of mercury is 9.7876 kJ/kg.
4. Find the volume of n-pentane at 500 K and 20 bar following Van der waals equation of state. Tc = 469.6 K, Pc = 33.7 bar
5. State Hess's law of constant heat summation. Calculate heat of formation of the gaseous ethyl alcohol at 298 K using following data :
   Standard heat of formation of CO₂ (g) = -393.51 kJ/mol
   

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   Standard heat of formation of H₂O (l) = –285.83 kJ/mol
   Heat of combustion of gaseous ethyl alcohol at 298 K = –1410.09 kJ/mol
6. Derive the expression for effect of temperature on fugacity coefficient.

SECTION-C

7. Show that the fugacity of a gas obeying the van der waals equation of state is given by
   

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   ln f = b/(V-b) - 2a/(RTV) + ln(RT/(V-b))
   where a and b are van der Waals constants.
8. Describe the criteria for chemical reaction equilibria. Calculate the equilibrium constant for the reaction N₂ + 3 H₂ ? 2 NH₃ at 500 K assuming that the standard heat of reaction is constant in temp. range 298 K to 500 K. Standard heat of formation and standard free energy of formation of NH₃ at 298 K are – 46100 J/mol and –16500 J/mol respectively.
9. For a binary system of components (1) and (2), the vapour pressures are given by the Antoine's equations
   ln P^sat₁ = 13.818 - 2477.07 / (T-40.00)
   

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   ln P^sat₂ = 13.859 - 2911.32 / (T-56.56)
   P is in kPa and T in K. Assume the solution as ideal. Calculate :
   1. The composition of liquid and vapour in equilibrium at 95 kPa and 335 K.
   2. The composition of the vapour in equilibrium with a liquid containing 40% (mol) pentane and the equilibrium temperature at P = 95 kPa.
   3. The total pressure and the vapour composition in equilibrium with a liquid of composition x1 = 0.40 at T = 333.2 ?.

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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