Chemical Reaction Engineering
Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion.

No change
Decrease
Increase
Either A or B, depends on the type of reaction

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Chemical Reaction Engineering
Brunaur, 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?

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
Langmuir
There is no dynamic equilibrium between successive layer
None of these

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Time for half change is independent of the initial concentration
Time for half change is half the time taken for completion of the reaction
Time for completion of the reaction is independent of the initial concentration
Reaction rate is trebled when the initial concentration is trebled

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Chemical Reaction Engineering
Mean residence time is equal to the space time, when

All of these
The temperature, pressure and the density of reaction mixture remains constant throughout the reactor
The feed rate is measured at temperature and pressure in the reactor
There is no change in number of moles in gaseous reaction

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