Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Directly proportional to the temperature difference on the two faces of the body
Directly proportional to the surface area of the body
All of these
Dependent upon the material of the body

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Heat and Mass Transfer
Film coefficient is defined as the ratio of

Thickness of film of fluid to the thermal conductivity
Temperature drop through the films of fluids to the thickness of film of fluids
Thickness of film of fluid to the temperature drop through the films of fluids
Thermal conductivity to the equivalent thickness of the film of fluid

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

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
All of these
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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