81. Which one shows the diagramatic heat balance in a furnace?
82. Maximum heat transfer in high temperature furnaces is by
83. Fuel economy in furnaces can be achieved by
84. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
85. Operation of blast furnace stove is based on the principles of a __________ furnace.
86. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of
87. Presence of SO2 in furnace gases attacks the ferrous metal by way of
88. The main function of a muffle in the muffle furnace is to
89. Which of the following is a periodic furnace?
90. Low stack loss indicates the
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