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
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

h₁ + h₂ + h₃

None of these

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

None of these

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Convection

None of these

Radiation

Conduction

Convection

None of these

Radiation

Conduction

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa/pv

Pb = pa + pv

Pb = pa - pv

Pb = pa × pv

Pb = pa/pv

Pb = pa + pv

Pb = pa - pv

Pb = pa × pv

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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

Thermal coefficient

Thermal conductivity

Temperature gradient

Thermal resistance

Thermal coefficient

Thermal conductivity

Temperature gradient

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Better insulation should be put over pipe and better one over it

Both may be put in any order

Inferior insulation should be put over pipe and better one over it

Whether to put inferior OIL over pipe or the better one would depend on steam temperature

Better insulation should be put over pipe and better one over it

Both may be put in any order

Inferior insulation should be put over pipe and better one over it

Whether to put inferior OIL over pipe or the better one would depend on steam temperature

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Move actually

Affect the intervening medium

Do not move actually

Does not affect the intervening medium

Move actually

Affect the intervening medium

Do not move actually

Does not affect the intervening medium

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Heat and Mass Transfer

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 process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Heat and Mass Transfer According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

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 A steam pipe is to be insulated by two insulating materials put over each other. For best results

Heat and Mass Transfer The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

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 process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

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
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body