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Heat and Mass Transfer

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

Conduction and radiation combined
Convection
Radiation
Conduction

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Heat and Mass Transfer
All radiations in a black body are

Reflected
Transmitted
Absorbed
Refracted

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Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt/cm4 °K
watt2/cm °K⁴
watt/cm2 °K⁴
watt/cm3 °K

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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

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Heat and Mass Transfer
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by

Convection
Conduction
Both convection and conduction
Radiation

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

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

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