Q. Natural draught produced by a chimney depends upon the

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Q. Gross & net calorific value is the same for

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Q. Junker's calorimeter is used to determine the calorific value of

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Q. Combustion reaction of fuels is a/an __________ reaction.

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Q. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

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Q. Which of the following constituents of coal is the most important in the production of coke?

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Q. High temperature in gasification of coal favours

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Q. When incomplete combustion loss is high, the flue gas analysis shows large amount of

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Q. The gas which contributes maximum to the heating value of natural gas is

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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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