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Heat and Mass Transfer

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

None of these
Convection
Radiation
Conduction

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Heat and Mass Transfer
The amount of radiation mainly depends on

Type of surface of body
All of these
Temperature of body
Nature of body

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Heat and Mass Transfer
The transfer of heat by molecular collision is known as

None of these
Conduction
Convection
Radiation

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal conductivity
Thermal coefficient
Temperature gradient
Thermal resistance

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)

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

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Heat and Mass Transfer
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

None of these
Thermal conductivity
Thermal coefficient
Thermal resistance

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