Q. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

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Q. Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

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Q. Actual flame temperature is always lower than the adiabatic flame temperature, because there is

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Q. Coke oven gas consists mainly of

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Q. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³ .

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Q. Coking coals are invariably

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Q. Which of the following accounts for maximum energy loss in a boiler ?

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Q. 'Fuel' can be defined as a substance which produces heat by

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Q. Washing of coal

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Q. Which of the following is not a manufactured fuel ?

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Q. Coke oven gas constitutes mainly of

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Q. Gross heating value of coal is __________ the net heating value.

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Q. Which of the following is a rich fuel gas ?

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Q. Low temperature carbonisation of coal produces

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Q. Blast furnace coke is made from coal by

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Q. Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.

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Q. Coke oven gas is stripped of its H₂S and mercaptans content by

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Q. In Lurgi coal gasifier,

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Q. Mineral matter content (M) and ash content (A) in coal are approximately related as

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Q. Use of pulverised coal in boiler furnace provides

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