Heat and Mass Transfer
Heat transfer takes place as per

First law of thermodynamic
Kirchoff's law
Zeroth law of thermodynamics
Second law of the thermodynamics

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
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

ANSWER DOWNLOAD EXAMIANS APP