EXAMIANS
Stefan Boltzmann law is applicable for heat transfer by
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The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
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40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
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Thermal diffusivity is
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Thermal conductivity of water at 20°C is of the order of
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If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
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The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
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A grey body is one whose absorptivity
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Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be
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According to Wien's law, the wavelength corresponding to maximum energy is proportion to
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