Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k. (dT/dx)

k. A. (dT/dx)

k. (dx/dT)

k. A. (dx/dT)

k. (dT/dx)

k. A. (dT/dx)

k. (dx/dT)

k. A. (dx/dT)

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Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Cube of the absolute temperature

Square of the absolute temperature

Fourth power of the absolute temperature

Absolute temperature

Cube of the absolute temperature

Square of the absolute temperature

Fourth power of the absolute temperature

Absolute temperature

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

Dependent upon the material of the body

All of these

Directly proportional to the temperature difference on the two faces of the body

Directly proportional to the surface area of the body

Dependent upon the material of the body

All of these

Directly proportional to the temperature difference on the two faces of the body

Directly proportional to the surface area of the body

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Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

Two dimensional cases only

Irregular surfaces

One dimensional cases only

Nonuniform temperature surfaces

Two dimensional cases only

Irregular surfaces

One dimensional cases only

Nonuniform temperature surfaces

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Boiler furnaces

None of these

Melting of ice

Condensation of steam in condenser

Boiler furnaces

None of these

Melting of ice

Condensation of steam in condenser

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Heat and Mass Transfer
Reynolds number is the ratio of

Kinematic viscosity to thermal diffusivity

Energy transferred by convection to that by conduction

Inertia force to viscous force

None of these

Kinematic viscosity to thermal diffusivity

Energy transferred by convection to that by conduction

Inertia force to viscous force

None of these

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Heat and Mass Transfer

Heat and Mass Transfer According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

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

Heat and Mass Transfer Fourier's law of heat conduction gives the heat flow for

Heat and Mass Transfer The heat is transferred by conduction, convection and radiation in

Heat and Mass Transfer Reynolds number is the ratio of

Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

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

Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Heat and Mass Transfer
Reynolds number is the ratio of