Chemical Reaction Engineering
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the

Space time for each parallel line is same
None of these
Space time for parallel lines is different
Larger reactors have more space time compared to smaller ones

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

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

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Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

High recycle for pure gas
All of these
Plug flow for dilute liquid requiring no large preheating of feed
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature

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