Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Equal to one
Greater than one
Equal to Nusselt number
Less than one

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Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at exit are in their hottest state
One fluid is in hottest state and other in coldest state at inlet
Both the fluids at inlet are in their hottest state
Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

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