The thermal diffusivities for solids are generally

Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for gases

More or less same as for liquids and gases

Less than those for liquids

More than those for liquids and gases

Less than those for gases

More or less same as for liquids and gases

Less than those for liquids

More than those for liquids and gases

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Heat and Mass Transfer
A non-dimensional number generally associated with natural convection heat transfer is

Grashoff number

Weber number

Nusselt number

Prandtl number

Grashoff number

Weber number

Nusselt number

Prandtl number

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Radiation

Conduction and convection

Convection

Conduction

Radiation

Conduction and convection

Convection

Conduction

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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 one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

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

All of these

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

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

All of these

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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

Planck's law

Wien's law

Stefan's law

Kirchhoff's law

Planck's law

Wien's law

Stefan's law

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Heat and Mass Transfer
Heat transfer takes place as per

Kirchoff's law

Second law of the thermodynamics

Zeroth law of thermodynamics

First law of thermodynamic

Kirchoff's law

Second law of the thermodynamics

Zeroth law of thermodynamics

First law of thermodynamic

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Heat and Mass Transfer

Heat and Mass Transfer The thermal diffusivities for solids are generally

Heat and Mass Transfer A non-dimensional number generally associated with natural convection heat transfer is

Heat and Mass Transfer The concept of overall coefficient of heat transfer is used in heat transfer problems of

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

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 Heat transfer takes place as per

Heat and Mass Transfer
The thermal diffusivities for solids are generally

Heat and Mass Transfer
A non-dimensional number generally associated with natural convection heat transfer is

Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

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

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
Heat transfer takes place as per