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Heat and Mass Transfer

Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Peclet number
Grashoff number
Biot number
Stanton number

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Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Biot number
Stanton number
Grashoff number
Prandtl number

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Heat and Mass Transfer
Joule sec is the unit of

Planck's constant
Universal gas constant
Kinematic viscosity
Thermal conductivity

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

P=1, x = 0, and a = 0
X = 0, a + p = 1
P = 0, x = 0 and a = 1
P = 0, x= 1, and a = 0

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

More or less same as for liquids and gases
Less than those for liquids
Less than those for gases
More than those for liquids and gases

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Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Absolute temperature
Fourth power of temperature
Fourth power of absolute temperature
Square of temperature

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