Chemical Reaction Engineering
A reactor is generally termed as an autoclave, when it is a

Atmospheric pressure CSTR
Atmospheric pressure tank reactor
High pressure batch reactor
High pressure tubular reactor

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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
There is no change in number of moles in gaseous reaction
The feed rate is measured at temperature and pressure in the reactor

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