Heat Transfer
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

Calenderia vertical tube evaporator
Horizontal tube evaporator
Long vertical evaporator
Agitated film evaporator

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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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