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Heat and Mass Transfer

Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

I²
F
Absolute temperature (T)
T

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

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

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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

Temperature
Area
Thickness
Time

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α = 0, ρ = 0 and τ = 1
α = 1, ρ = 0 and τ = 0
α + ρ = 1 and τ = 0
α = 0, ρ = 1 and τ = 0

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Conduction and convection
Conduction
Convection
Radiation

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium inlet and outlet
Cold water inlet and outlet
Hot medium outlet and cold water inlet
Hot medium outlet and cold water outlet

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MORE MCQ ON Heat and Mass Transfer

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