Chemical Reaction Engineering
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is increased or the catalyst diffusivity is reduced
Catalyst size is reduced or the catalyst diffusivity is reduced
Catalyst size is reduced or the catalyst diffusivity is increased
Catalyst size is increased or the catalyst diffusivity is increased

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Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

A highly exothermic reaction is to be controlled
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
All of these
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided

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Chemical Reaction Engineering
For the same residence time, which one will give the maximum conversion?

Single tubular flow reactor (v = 5 litres)
Single stirred tank (v = 5 litres)
Stirred tank followed by tubular flow reactor (each of 2.5 litres)
Two stirred tank (each of 2.5 litres) in series

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