Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

20°C
40°C
66.7°C
60°C

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

In radiation, increasing the temperature and reducing the emissivity.
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.

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