The amount of heat flow through a body by conduction is

Heat and Mass Transfer
The amount of heat flow through a body by conduction is

All of these

Directly proportional to the surface area of the body

Directly proportional to the temperature difference on the two faces of the body

Dependent upon the material of the body

All of these

Directly proportional to the surface area of the body

Directly proportional to the temperature difference on the two faces of the body

Dependent upon the material of the body

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

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

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
Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

S.H/(S.H + L.H)

(S.H + L.H) /S.H

(L.H - S.H)/S.H

S.H/(L.H - S.H)

S.H/(S.H + L.H)

(S.H + L.H) /S.H

(L.H - S.H)/S.H

S.H/(L.H - S.H)

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

J/m² sec

W/m °K

Option (B) and (C) above

J/m °K sec

J/m² sec

W/m °K

Option (B) and (C) above

J/m °K sec

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Increases

Decreases

May increase or decrease depending on temperature

Remain constant

Increases

Decreases

May increase or decrease depending on temperature

Remain constant

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = ρ V l /μ

RN = μ cp/k

RN = hl/k

RN = V²/t.cp

RN = ρ V l /μ

RN = μ cp/k

RN = hl/k

RN = V²/t.cp

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Heat and Mass Transfer

Heat and Mass Transfer The amount of heat flow through a body by conduction is

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

Heat and Mass Transfer Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

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

Heat and Mass Transfer Thermal conductivity of solid metals with rise in temperature normally

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
The amount of heat flow through a body by conduction is

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

Heat and Mass Transfer
Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

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

Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)