EXAMIANS
The radiation emitted by a black body is known as
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According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
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Absorptivity of a body will be equal to its emissivity
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Planck’s law holds good for
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Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of
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The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)
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Thermal conductivity of non-metallic amorphous solids with decrease in temperature
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The thermal diffusivities for gases are generally
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The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as
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In heat exchangers, degree of approach is defined as the difference between temperatures of
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