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. (dx/dT)

(dx/dT)

k.

(dT/dx)

k. (dT/dx)

k. (dx/dT)

(dx/dT)

k.

(dT/dx)

k. (dT/dx)

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Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number, Grashoff's number

Prandtl number, Grashoff's number

Reynold's number

Grashoff's number

Reynold's number, Grashoff's number

Prandtl number, Grashoff's number

Reynold's number

Grashoff's number

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Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Kirchhoff’s law

Wine’s law

Planck’s law

Stefan’s law

Kirchhoff’s law

Wine’s law

Planck’s law

Stefan’s law

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Heat and Mass Transfer
The critical radius is the insulation radius at which the resistance to heat flow is

Minimum

None of these

Zero

Maximum

Minimum

None of these

Zero

Maximum

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Stefan's law

Planck's law

Wien's law

Kirchhoff's law

Stefan's law

Planck's law

Wien's law

Kirchhoff's law

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Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube

Equivalent thickness of film

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Equivalent thickness of film

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

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Heat and Mass Transfer

Heat and Mass Transfer In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Heat and Mass Transfer The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer The critical radius is the insulation radius at which the resistance to heat flow is

Heat and Mass Transfer The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Heat and Mass Transfer Film coefficient is defined as Inside diameter of tube

Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer
The critical radius is the insulation radius at which the resistance to heat flow is

Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube