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Heat and Mass Transfer

Heat and Mass Transfer
The emissivity for a black body is

0.75
1
0.5

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Melting of ice
Condensation of steam in condenser
None of these
Boiler furnaces

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Heat and Mass Transfer
Pick up the wrong case. Heat flowing from one side to other depends directly on

Time
Thickness
Temperature difference
Face area

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Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

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

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Heat and Mass Transfer
Which of the following has least value of conductivity?

Air
Plastic
Water
Glass

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

Radiation
Convection
None of these
Conduction

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