Chemical Reaction Engineering
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

Very low temperature should be used throughout the reaction
Very high temperature should be used throughout the reaction
None of these
Temperature should be high in the beginning and decreased towards the end of the reaction

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Chemical Reaction Engineering
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b

Avoid recycle, when a > b
Use batch reactor or plug flow reactor, when a > b
Use high pressure and eliminate inerts, when a > b
Use CSTR with a high conversion, when a > b

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Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

Conversion is cent per cent after three hours
It takes three hours to dump the entire volume of the reactor with feed
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
Three reactor volumes of feed can be processed every hour

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