121. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
122. Rotary kilns are used in the
123. Regenerators are normally provided in the
124. In a furnace employing forced draught as compared to induced draught,
125. Coke ovens in steel plant are heated by
126. Which of the following is not a recuperative furnace?
127. The purpose of controlling the furnace atmosphere is to prevent surface attack by
128. Regenerators are used for waste heat recovery in
129. The heat recoverable from flue gases of furnaces depends on the
130. Shaft furnaces are used for
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