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
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Both may be put in any order
Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Inferior insulation should be put over pipe and better one over it
Better insulation should be put over pipe and better one over it

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Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

All of these
Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

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