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.Management Sciences
Category: Chemical Reaction
Which of the following fixes the volume of a batch reactor for a particular conversion and production rate ?
A. Operating conditions (e.g. pressure and temperature)
B. Rate constant
C. Density of mixture
D. None of these
Fluid flow in a real packed bed can be approximated as ________________ model?
A. Plug flow
B. Dispersion
C. Mixed flow
D. Tank in series
In a semi-batch reactor __________________?
A. Mixing takes place in axial direction only
B. Velocity of reaction can be controlled
C. Condition similar to plug flow reactor exists
D. Residence time is constant
A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is_______________________?
A. d(VCA)/dt = -F (CAF – CA) – kCA2V
B. d(VCA)/dt = F (CAF – CA) – kCA2V
C. d(VCA)/dt = -FCA – kCA2V
D. d(VCA)/dt = FCAF – kCA2V
A batch reactor is suitable for__________________?
A. Achieving cent percent conversion of reactants into products
B. Large scale gaseous phase reactions
C. Liquid phase reactions
D. Obtaining uniform polymerisation products in highly exothermic reactions
Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?
A. Langmuir’s assumption applies to every adsorbed layer
B. There is no dynamic equilibrium between successive layer
C. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer
(except the first one) is involved in each of the evaporation process
D. None of these
A Catalyst ____________________?
A. Increases the equilibrium concentration of the product
B. Changes the equilibrium constant of the reaction
C. Shortens the time to reach the equilibrium
D. None of these
Velocity of a chemical reaction___________________?
A. Decreases with increase in temperature
B. Increases with increase of pressure of reactants for all reactions
C. Decreases with increase of reactant concentration
D. None of these
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?
A. Decreases
B. Increases
C. Is at the highest allowable temperature throughout
D. First increases and then decreases
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________?
A. More
B. Less
C. Same
D. Either A. or B., depends on other factors
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