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

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

(h₁.h₂.h₃)1/3

None of these

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

(h₁.h₂.h₃)1/3

None of these

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Heat and Mass Transfer
Free convection flow depends on

Coefficient of viscosity

Gravitational force

Density

All of these

Coefficient of viscosity

Gravitational force

Density

All of these

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Heat and Mass Transfer
The highest thermal diffusivity is of

Wood

Lead

Iron

Concrete

Wood

Lead

Iron

Concrete

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Heat and Mass Transfer
Joule sec is the unit of

Universal gas constant

Kinematic viscosity

Thermal conductivity

Planck's constant

Universal gas constant

Kinematic viscosity

Thermal conductivity

Planck's constant

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Heat and Mass Transfer
According of Kirchhoff's law

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Emissive power and absorptivity are constant for all bodies

Emissive power depends on temperature

Radiant heat is proportional to fourth power of absolute temperature

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Emissive power and absorptivity are constant for all bodies

Emissive power depends on temperature

Radiant heat is proportional to fourth power of absolute temperature

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Heat and Mass Transfer
A grey body is one whose absorptivity

Is equal to its emissivity

Does not vary with temperature and. wavelength of the incident ray

Varies with wavelength of the incident ray

Varies with temperature

Is equal to its emissivity

Does not vary with temperature and. wavelength of the incident ray

Varies with wavelength of the incident ray

Varies with temperature

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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 Free convection flow depends on

Heat and Mass Transfer The highest thermal diffusivity is of

Heat and Mass Transfer Joule sec is the unit of

Heat and Mass Transfer According of Kirchhoff's law

Heat and Mass Transfer A grey body is one whose absorptivity

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
Free convection flow depends on

Heat and Mass Transfer
The highest thermal diffusivity is of

Heat and Mass Transfer
Joule sec is the unit of

Heat and Mass Transfer
According of Kirchhoff's law

Heat and Mass Transfer
A grey body is one whose absorptivity