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Previous Year Exam Questions of Chemical Reaction Engineering of bput - CRE by Bput Toppers

  • Chemical Reaction Engineering - CRE
  • 2018
  • PYQ
  • Biju Patnaik University of Technology BPUT - BPUT
  • Chemical Engineering
  • B.Tech
  • 13 Offline Downloads
  • Uploaded 11 months ago
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Registration No : Total number of pages : 02 B.Tech. PCCH4305 6th Semester Back Examination 2017-18 CHEMICAL REACTION ENGINEERING BRANCH : CHEM Time : 3 Hours Max Marks : 70 Q.CODE : C537 Answer Question No. 1 which is compulsory and any FIVE from the rest. The figures in the right-hand margin indicate marks. Assume suitable notations and any missing data wherever necessary. Answer all parts of a question at a place. Q1. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) Q2. Q3. (a) (b) Answer the following questions : (2 x 10) Discuss the significance of Activation energy. Enumerate the ways of defining the rate equation. Define a constant density system with suitable examples. Write the integrated equation for a third order reaction. What are the disadvantages of half life method of interpreting batch reactor data? Find out the holding time for the conversion in a mixed reactor accomplishing a reaction A → 3R is 50% when gaseous reactant A is introduced at the rate of 1 lit/sec and the leaving flow rate is 2 lit/sec. Give an account of chain and non-chain reactions with a suitable example. Briefly describe about age distribution of fluid. A common rule of temperature is that the rate of reaction doubles for each 10o rise in temperature. What activation energy would this suggest at a temperature of 25oC? Define selectivity in multiple reactions. Derive the integrated rate equation for a reversible unimolecular type first order reaction. Explain in details the typical concentration-time curves for the same. (10) Derive the performance equation of a mixed flow reactor for constant and variable systems. From the data given below show that the conversion of N- para – chloroacetanilide is a reaction of first order : (7) Time (h) N 0 49.3 1 35.6 2 25.75 (3) 3 18.5 Where N is the number of ml of Na2S2O3 solution required for a definite volume mixture. Q4. (a) (b) Give a qualitative description about product distribution in case of parallel reactions. Differentiate between molecularity and order of reaction with suitable examples. (6) (4)

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Q5. (a) (b) Q6. Q7. (a) (b) Q8. (a) (b) (c) (d) Define ∈A. Consider a gaseous feed at T 0 = 1000 K, P0 = 5 atm, CA0 = 100moles/lit, CB0 = 200moles/lit enters a flow reactor in which A + B  5 R occurs. Find ∈A. In an isothermal batch reactor 70 % of a reactant is converted in 13 minutes. Find the space time and space velocity needed to effect this conversion in a plug flow reactor and a mixed flow reactor. (3) Compare the size of mixed flow reactor with plug flow reactor for a second order reaction. (10) Explain the differential method of analysis of rate data. Consider a gas phase reaction 2A = R + 2S with unknown kinetics. If for 90 % conversion of a A in plug flow reactor, the space velocity of 1 lit/min is needed, find the corresponding space time and mean residence time of a fluid in the reactor. (4) (6) Write short notes on any TWO : Residence time distribution Basics of non-ideal flow Temperature dependency from transition state theory Steady state continuous stirred tank reactor (7) (5 x 2)

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