The critical thickness of insulation for a sphere is

Heat and Mass Transfer
The critical thickness of insulation for a sphere is

k/h₀

2k/h₀

h₀/2k

h₀/k

k/h₀

2k/h₀

h₀/2k

h₀/k

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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 one cm cube of material when opposite faces are maintained at a temperature difference of 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 a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

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

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

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Heat and Mass Transfer
The expression Q = ρ AT4 is called

Newton Reichmann equation

Fourier equation

Joseph-Stefan equation

Stefan-Boltzmann equation

Newton Reichmann equation

Fourier equation

Joseph-Stefan equation

Stefan-Boltzmann equation

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal resistance

Temperature gradient

Thermal coefficient

Thermal conductivity

Thermal resistance

Temperature gradient

Thermal coefficient

Thermal conductivity

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Heat and Mass Transfer
Thermal diffusivity is a

Dimensionless parameter

Physical property of a substance

Function of temperature

All of these

Dimensionless parameter

Physical property of a substance

Function of temperature

All of these

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Heat and Mass Transfer
The insulation ability of an insulator with the presence of moisture would

Remain unaffected

May increase/decrease depending on temperature and thickness of insulation

Decrease

Increase

Remain unaffected

May increase/decrease depending on temperature and thickness of insulation

Decrease

Increase

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Heat and Mass Transfer

Heat and Mass Transfer The critical thickness of insulation for a sphere is

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

Heat and Mass Transfer The expression Q = ρ AT4 is called

Heat and Mass Transfer Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer Thermal diffusivity is a

Heat and Mass Transfer The insulation ability of an insulator with the presence of moisture would

Heat and Mass Transfer
The critical thickness of insulation for a sphere is

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

Heat and Mass Transfer
The expression Q = ρ AT4 is called

Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer
Thermal diffusivity is a

Heat and Mass Transfer
The insulation ability of an insulator with the presence of moisture would