EXAMIANS
The transfer of heat by molecular collision is smallest in
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Absorptivity of a body will be equal to its emissivity
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If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called
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Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)
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The thermal diffusivities for gases are generally
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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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Temperature of steam at around 540°C can be measured by
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The use of heat exchangers is made in
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The most commonly used method for the design of duct size is the
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Log mean temperature difference in case of counter flow compared to parallel flow will be
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