Q. Maximum thermal efficiency of boiler may be about __________ percent.

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Q. Rotary kilns are used in the

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Q. Thermal efficiency of furnaces can be improved by

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Q. Shaft furnaces are used for

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Q. Hearth furnaces are not used for

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Q. Turn down ratio of a burner

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Q. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?

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Q. Which is a regenerative furnace ?

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Q. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

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Q. The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

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Q. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

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Q. Use of pulverised coal in boilers provides

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Q. Regenerators are normally provided in the

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Q. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.

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Q. Furnace pressure is normally controlled by regulating the

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Q. An example of indirectly heated furnace is the

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Q. Specific heating capacity of a furnace is expressed as

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Q. Forced recirculation of furnace gases is practised

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Q. Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the

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Q. Air filtration in a furnace

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