31. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
32. Hearth furnaces are not used for
33. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
34. The heating capacity of continuous reheating furnace depends upon the
35. Means for giving direction to the circulation of gases in furnaces are
36. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
37. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
38. Protective gas used in the annealing furnace for steel coil comprises of
39. __________ furnace is not an electric furnace.
40. In reverberatory furnace, charge is heated mainly by
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