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Heat and Mass Transfer

Heat and Mass Transfer
The highest thermal diffusivity is of

Concrete
Lead
Wood
Iron

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

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

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Heat and Mass Transfer
Unit of thermal diffusivity is

m²/hr
m²/hr °C
kcal/m² hr
kcal/m. hr °C

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Heat and Mass Transfer
Heat is closely related with

Energy
Temperature
Liquids
Entropy

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

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

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Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Absolute temperature
Square of the absolute temperature
Fourth power of the absolute temperature
Cube of the absolute temperature

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MORE MCQ ON Heat and Mass Transfer

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