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Heat and Mass Transfer

Heat and Mass Transfer
The emissivity for a black body is

1
0.5
0.75

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

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

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Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Area
Time
Temperature
Thickness

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Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

White body
Grey body
Opaque body
Black body

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

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

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

None of these
Solids
Liquids
Gases

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