Chemical Process
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

Increase the cellulose content
Remove lignin by way of crystallisation
Avoid mechanical weakening of fibre
None of these

ANSWER DOWNLOAD EXAMIANS APP

Chemical Process
Liquefaction of gases can not be done by

Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine
Merely compressing it beyond critical pressure

ANSWER DOWNLOAD EXAMIANS APP