1. In heat exchangers, degree of approach is defined as the difference between temperatures of
2. Fouling factor is used
3. The natural convection air cooled condensers are used in
4. The concept of overall coefficient of heat transfer is used in heat transfer problems of
5. 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
6. 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)
7. Emissivity of a white polished body in comparison to a black body is
8. The heat of sun reaches to us according to
9. Thermal diffusivity of a substance is
10. The insulation ability of an insulator with the presence of moisture would
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