21. Forced recirculation of furnace gases is practised
22. The amount of combustible escaping uncon-sumed from the furnace, depends upon the
23. Power required in case of forced draught as compared to induced draught (for the same draught produced) is
24. Which is the most thermally efficient furnace?
25. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
26. An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
27. Which of the following variables affects the furnace capacity?
28. Air filtration in a furnace
29. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
30. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
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