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Heat and Mass Transfer

Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

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

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Free convection
Convection
Radiation
Forced convection

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Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heating of building
Heat received by a person from fireplace
Blast furnace
Cooling of parts in furnace

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

None of these
Liquids
Solids
Gases

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Heat and Mass Transfer
The heat of sun reaches to us according to

Radiation
Convection
Conduction
None of these

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Heat and Mass Transfer
Metals are good conductors of heat because

They contain free electrons
Their atoms are relatively far apart
Their atoms collide frequently
They have high density

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