Heat Transfer
Baffle spacing

Should be less than one fifth the diameter of the shell
Is not the same as baffle pitch
None of these
Should be less than the inside diameter of the shell

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

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