A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

None of these

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

None of these

1/h₁ + 1/h₂ + 1/h₃

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

Planck’s law

Wine’s law

Stefan’s law

Kirchhoff’s law

Planck’s law

Wine’s law

Stefan’s law

Kirchhoff’s law

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

Film coefficient × Inside diameter Thermal conductivity

Equivalent thickness of film

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Film coefficient × Inside diameter Thermal conductivity

Equivalent thickness of film

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

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Heat and Mass Transfer
The heat transfer takes place according to

Zeroth law of thermodynamics

Second law of thermodynamics

Kirchhoff's law

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Kirchhoff's law

First law of thermodynamics

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)

P = 0, x = 0 and a = 1

X = 0, a + p = 0

P= 1, T = 0 and a = 0

P = 0, x = 1 and a = 0

P = 0, x = 0 and a = 1

X = 0, a + p = 0

P= 1, T = 0 and a = 0

P = 0, x = 1 and a = 0

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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

Kirchhoff's law

Stefan's law

Wien's law

Planck's law

Kirchhoff's law

Stefan's law

Wien's law

Planck's law

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Heat and Mass Transfer

Heat and Mass Transfer A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

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

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

Heat and Mass Transfer The heat transfer takes place according to

Heat and Mass Transfer Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)

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
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

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

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

Heat and Mass Transfer
The heat transfer takes place according to

Heat and Mass Transfer
Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)

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