A non-dimensional number generally associated with natural convection heat transfer is

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

Prandtl number

Weber number

Nusselt number

Grashoff number

Prandtl number

Weber number

Nusselt number

Grashoff number

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.01

0.002

0.1

0.02

0.01

0.002

0.1

0.02

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Parallel flow type

Counter flow type

Cross flow type

Regenerator type

Parallel flow type

Counter flow type

Cross flow type

Regenerator type

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

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

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

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Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

Decreases

May increase or decrease depending on temperature

Increases

Remain constant

Decreases

May increase or decrease depending on temperature

Increases

Remain constant

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Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Square of temperature

Absolute temperature

Fourth power of absolute temperature

Fourth power of temperature

Square of temperature

Absolute temperature

Fourth power of absolute temperature

Fourth power of temperature

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Heat and Mass Transfer

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

Heat and Mass Transfer Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer The automobile radiator is a heat exchanger of

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

Heat and Mass Transfer Thermal conductivity of water in general with rise in temperature

Heat and Mass Transfer According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

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

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer
The automobile radiator is a heat exchanger of

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

Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to