101. In heat exchangers, degree of approach is defined as the difference between temperatures of
102. Fouling factor is used
103. The natural convection air cooled condensers are used in
104. The concept of overall coefficient of heat transfer is used in heat transfer problems of
105. An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
106. The logarithmic mean temperature difference ($${{\text{t}}_{\text{m}}}$$) is given by (where $$\Delta {{\text{t}}_1}$$ and $$\Delta {{\text{t}}_2}$$ are temperature differences between the hot and cold fluids at entrance and exit)
107. Emissivity of a white polished body in comparison to a black body is
108. The heat of sun reaches to us according to
109. Thermal diffusivity of a substance is
110. The insulation ability of an insulator with the presence of moisture would
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