Q.1
14 Marks(a)
Define rate constant with its significance.
(b)
Define rate of reaction considering unit volume, mass and surface of solid in fluid solid system.
(c)
Derive performance equation for steady state plug flow reactor.
Gujarat Technological UniversitySummer 2025 examination
GTU 3160506 Chemical Reactions Engineering I Summer 2025 Question Paper & PDF
B.E. · Chemical Engineering · Semester 6 · Subject code 3160506
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Derive equation for a unimolecular type first order reaction for constant volume batch reactor using integral method.
(b)
Give brief about shifting order reaction.
(c)
Give detail classification of reactions with example.
OR
(c)
For the decomposition A R, CA0 = 1 mol/liter, in a batch reactor conversion is 75% after 1 hour, and is just complete after 2 hours. Find a rate equation to represent this kinetics.
Q.3
14 Marks(a)
Write in brief about variables affecting rate of reactions.
(b)
Discuss about various types of nonideality exists in different reactors.
(c)
Derive the equation for half life using overall order of irreversible reaction.
OR
(a)
The concentration readings in Table represent a continuous response to a pulse input into a closed vessel which is to be used as a chemical reactor. Calculate the mean residence time of fluid in the vessel. Time, t min 0 5 10 15 20 25 30 35 Tracer output conc. C pulse, gm /liter 0 3 5 5 4 2 1 0
(b)
Discuss autocatalytic reaction with conversion-time and rate-concentration Curves.
(c)
Discuss optimum temperature progression in detail.
Q.4
14 Marks(a)
Discuss parallel reactions with examples.
(b)
Milk is pasteurized if it is heated to 63°C for 30 min, but if it is heated to 74°C it only needs 15 sec for the same result. Find the activation energy of this sterilization process.
(c)
Derive performance equation for steady state ideal batch reactor.
OR
(a)
Explain recycle ratio and the performance equation of recycle plug flow reactors.
(b)
Show the graphical representation of energy balance equation for adiabatic operation.
(c)
Explain tracer experiment with equations for pulse response in non-ideal flow reactor with equations and curves.
Q.5
14 Marks(a)
Define: Conversion, yield, space time.
(b)
Explain differential method of analysis to find rate of reaction.
(c)
Discuss qualitative product distribution for irreversible first order reaction in series.
OR
(a)
Explain selectivity with its equation.
(b)
Discuss about different size of mixed flow reactors in series.
(c)
Differentiate between contacting patterns in continuous flow operations and noncontinuous operations for various combination of high and low concentration of reactants for maximizing the desired product.
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About this paper
Official Gujarat Technological University (GTU) examination paper for Chemical Reactions Engineering I (Summer 2025, B.E. · Chemical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.