Q. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.

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Q. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.

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Q. Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

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Q. Pick out the wrong statement.

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Q. Stack heat losses can be minimised by

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Q. Laboratory gas is obtained by the cracking of

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Q. Bituminous coal

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Q. Ratio of primary air to secondary air increases with increase in the rank of coal, because the

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Q. Higher percentage of ash in coal meant for the production of metallurgical grade coke

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Q. Combustion of pulverised coal as compared to that of lump coal

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Q. 'Wobbe index' is a characteristic of

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Q. A coal with high ash content is undesirable, as

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Q. Presence of free moisture in coal during its high temperature carbonisation

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Q. Higher efficiency in the combustion of solid fuel can not be achieved by

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Q. A coal containing very high percentage of durain is called __________ coal.

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Q. During combustion of gaseous fuels, deficiency of air

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Q. Gross and net calorific value of a fuel will be the same

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Q. Low temperature carbonisation

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Q. Gray King Assay and Swelling Index of a coal is a measure of its

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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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