Chemical Reaction Engineering
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

Unpredictable from the data
Greater than
Equal to
Smaller than

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

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Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ and θ are always equal
τ = θ , when the fluid density changes in the reactor
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant
τ = θ , for a non-isothermal reactor

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