Unit of thermal conductivity in S.I. units is

Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

W/m °K

J/m² sec

J/m °K sec

Option (B) and (C) above

W/m °K

J/m² sec

J/m °K sec

Option (B) and (C) above

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Heat and Mass Transfer
The emissivity for a black body is

1

0.75

0.5

1

0.75

0.5

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissive power

Absorptivity

Emissivity

Absorptive power

Emissive power

Absorptivity

Emissivity

Absorptive power

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Heat and Mass Transfer
According of Kirchhoff's law

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

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

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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 a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

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

All of these

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

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

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

All of these

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Equal to

Inversely proportional to

Directly proportional to

None of these

Equal to

Inversely proportional to

Directly proportional to

None of these

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Heat and Mass Transfer

Heat and Mass Transfer Unit of thermal conductivity in S.I. units is

Heat and Mass Transfer The emissivity for a black body is

Heat and Mass Transfer The ratio of the energy absorbed by the body to total energy falling on it is called

Heat and Mass Transfer According of Kirchhoff's law

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

Heat and Mass Transfer The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

Heat and Mass Transfer
The emissivity for a black body is

Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Heat and Mass Transfer
According of Kirchhoff's law

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

Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.