Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

multiple effect evaporator
multiple effect evaporators followed by a crystalliser
single effect evaporator followed by a crystalliser
single effect evaporator

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Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
Outlent temperature of both the hot and cold fluid are same
None of these
Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

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