Heat Transfer
The purpose of providing a 'catchall' in the vapor line of an evaporator is to

Arrest the entrained liquid
Create vacuum
Regulate the vapor flow
Vent the non-condensible gases

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

Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
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

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