Heat Transfer
The purpose of floating head in a heat exchanger is to

Facilitate its lengthening, if needed
Decrease the pressure drop
Avoid buckling of tubes
Provide support for tubes

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

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

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