Heat Transfer
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

Infinity
Minimum
Maximum
Zero

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Heat Transfer
If Prandtl number is greater than the Schmidt number, then the

thermal & concentration boundary layers are of equal thickness
thermal boundary layer lies inside the concentration boundary layer
concentration boundary layer lies inside the thermal boundary layer
none of the listed here

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