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Heat and Mass Transfer

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

Stanton number
Grashoff number
Prandtl number
Biot number

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = S/ρk
h = kρ/S
h = k/ ρS
h = ρS/k

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Heat and Mass Transfer
The use of heat exchangers is made in

Condensers and boilers in steam plants
Radiators in automobile
Condensers and evaporators in refrigeration and air conditioning units
All of these

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Heat and Mass Transfer
The natural convection air cooled condensers are used in

Domestic refrigerators
All of these
Water coolers
Room air conditioners

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Heat and Mass Transfer
Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.

Cold body to hot body
Hot body to cold body
Smaller body to larger body
Larger body to smaller body

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different heat contents
Different specific heat
Different atomic structure
Different temperatures

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