Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

All of these
In convection, stirring of the fluid and cleaning the heating surface.
In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
In radiation, increasing the temperature and reducing the emissivity.

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Heat and Mass Transfer
In counter flow heat exchangers

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

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