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Heat and Mass Transfer

Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

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

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Wavelength has nothing to do with it
Remain same at all wavelengths
Shorter wavelength
Longer wavelength

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = μ cp/k
RN = hl/k
RN = ρ V l /μ
RN = V²/t.cp

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Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

Decreases
Increases
Remain constant
May increase or decrease depending on temperature

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Heat and Mass Transfer
Heat is closely related with

Entropy
Temperature
Liquids
Energy

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Solid ice
Water
Steam
Melting ice

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