81. jH factor for heat transfer depends upon the __________ number.
82. The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is
83. With increase in porosity, the thermal conductivity of a solid substance
84. 'Duhring's plot' is of use in
85. Heat exchangers operating, when the asymptotic range is reached,
86. In natural convection heat transfer, the correlating parameter is the
87. Stefen's block body radiation law can also be derived from __________ law.
88. What is the emissivity of a black body?
89. Pick out the wrong statement.
90. Unsteady state heat conduction occurs, when
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