Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.16736111111111

0.042361111111111

0.043055555555556

0.084027777777778

0.16736111111111

0.042361111111111

0.043055555555556

0.084027777777778

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P=1, T = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P=1, T = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Less than one

Greater than one

Equal to one

Equal to Nusselt number

Less than one

Greater than one

Equal to one

Equal to Nusselt number

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Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Square of the absolute temperature

Fourth power of the absolute temperature

Cube of the absolute temperature

Absolute temperature

Square of the absolute temperature

Fourth power of the absolute temperature

Cube of the absolute temperature

Absolute temperature

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

Wine’s law

Stefan’s law

Planck’s law

Kirchhoff’s law

Wine’s law

Stefan’s law

Planck’s law

Kirchhoff’s law

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

None of these

Minimum energy

Both (A) and (B)

Maximum energy

None of these

Minimum energy

Both (A) and (B)

Maximum energy

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Heat and Mass Transfer

Heat and Mass Transfer Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

Heat and Mass Transfer Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

Heat and Mass Transfer The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Heat and Mass Transfer According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

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

Heat and Mass Transfer Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

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

Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.