Unit of thermal conductivity in S.I. units is

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

Option (B) and (C) above

W/m °K

J/m °K sec

J/m² sec

Option (B) and (C) above

W/m °K

J/m °K sec

J/m² sec

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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

None of these

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

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Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Wien’s law

Fourier's law

Stefan's law

Planck's law

Wien’s law

Fourier's law

Stefan's law

Planck's law

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Heat and Mass Transfer
Thermal conductivity of wood depends on

All of these

Moisture

Density

Temperature

All of these

Moisture

Density

Temperature

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α + ρ = 1 and τ = 0

α = 0, ρ = 0 and τ = 1

α = 1, ρ = 0 and τ = 0

α = 0, ρ = 1 and τ = 0

α + ρ = 1 and τ = 0

α = 0, ρ = 0 and τ = 1

α = 1, ρ = 0 and τ = 0

α = 0, ρ = 1 and τ = 0

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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

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

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

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

Heat and Mass Transfer The value of the wavelength for maximum emissive power is given by

Heat and Mass Transfer Thermal conductivity of wood depends on

Heat and Mass Transfer When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

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

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

Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Heat and Mass Transfer
Thermal conductivity of wood depends on

Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

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