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

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

None of these

(h₁.h₂.h₃)1/3

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

None of these

(h₁.h₂.h₃)1/3

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Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

More

Less

Depends on other factors

Same

More

Less

Depends on other factors

Same

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Heat and Mass Transfer
Reynolds number is the ratio of

Energy transferred by convection to that by conduction

None of these

Kinematic viscosity to thermal diffusivity

Inertia force to viscous force

Energy transferred by convection to that by conduction

None of these

Kinematic viscosity to thermal diffusivity

Inertia force to viscous force

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Heat and Mass Transfer
Planck’s law holds good for

All of these

polished bodies

all coloured bodies

black bodies

All of these

polished bodies

all coloured bodies

black bodies

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Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Radiation

Conduction

Convection

Conduction and radiation combined

Radiation

Conduction

Convection

Conduction and radiation combined

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Directly proportional to the difference of temperatures between the two bodies

Directly proportional to the surface area

Either (A) or (B)

Both (A) and (B)

Directly proportional to the difference of temperatures between the two bodies

Directly proportional to the surface area

Either (A) or (B)

Both (A) and (B)

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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 Log mean temperature difference in case of counter flow compared to parallel flow will be

Heat and Mass Transfer Reynolds number is the ratio of

Heat and Mass Transfer Planck’s law holds good for

Heat and Mass Transfer Stefan Boltzmann law is applicable for heat transfer by

Heat and Mass Transfer According to Newton's law of cooling, the heat transfer from a hot body to a cold body 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
Log mean temperature difference in case of counter flow compared to parallel flow will be

Heat and Mass Transfer
Reynolds number is the ratio of

Heat and Mass Transfer
Planck’s law holds good for

Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is