EXAMIANS
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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The critical temperature is the temperature
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The concept of overall coefficient of heat transfer is used in heat transfer problems of
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Thermal conductivity of water at 20°C is of the order of
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The unit of overall coefficient of heat transfer is
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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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The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
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When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,
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The heat of sun reaches to us according to
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Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
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