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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Mechanical Engineering · all questionsHeat And Mass Transfer
Heat And Mass Transfer
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The thermal diffusivities for solids are generally
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Heat transfer by radiation mainly depends upon
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The transfer of heat by molecular collision is known as
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According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
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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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The heat transfer takes place according to
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In case of liquids and gases, the heat transfer takes place according to
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Depending on the radiating properties, a body will be opaque when
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Log mean temperature difference in case of counter flow compared to parallel flow will be
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In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
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Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
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The amount of radiation mainly depends on
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The heat transfer by conduction through a thick cylinder (Q) is given by (where T1 = Higher temperature, T2 = Lower temperature, r1 = Inside radius, r2 = Outside radius, = Length of cylinder and k = Thermal conductivity)
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Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, = Density of substance, S = Specific heat and k = Thermal conductivity)
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Which of the following is expected to have highest thermal conductivity?
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Which of the following has maximum value of thermal conductivity?
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Free convection flow depends on
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The critical thickness of insulation for a sphere is
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Q100
Open questionUnit of thermal conductivity in M.K.S. units is
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