Q. Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

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Q. In producer gas making furnace, steam is added along with air to mainly control the

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Q. In order to maintain a reducing atmosphere in a furnace, it should have

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Q. Which is the most thermally efficient furnace ?

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Q. The heat recoverable from flue gases of furnaces depends on the

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Q. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.

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Q. Which is a continuous furnace ?

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Q. The reason for excessive clinker formation in gas producers is the

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Q. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

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Q. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.

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Q. Low stack loss indicates the

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Q. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

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Q. __________ is an indirectly heated furnace.

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Q. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.

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Q. In a muffle furnace, the muffle

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Q. Which is not a hearth furnace ?

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Q. An example of shaft furnace is the

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Q. Example of an indirectly heated furnace is

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Q. Which furnace employs preheating, heating and soaking zones ?

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Q. Calcination of limestone to produce lime is done in a __________ kiln.

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