21. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as
22. Reynolds number is the ratio of
23. If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
24. Kirchhoff's law states that
25. Metals are good conductors of heat because
26. Thermal conductivity of water at 20°C is of the order of
27. Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of
28. According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
29. The critical temperature is the temperature
30. Thermal conductivity of non-metallic amorphous solids with decrease in temperature
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