Q. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

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Q. Blast furnace gas burns with a bluish flame, because of the presence of

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Q. The calorific value of natural gas is about __________ kcal/Nm³.

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Q. Low temperature carbonisation of coal takes place at __________ °C.

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Q. Critical Air Blast (CAB) value of coke is a direct measure of its

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Q. The function of secondary combustion air is to

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Q. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

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Q. Which of the following is called "blue gas" ?

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Q. Caking index of a coal is a measure of its

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Q. Calorific value of furnace oil is about __________ Kcal/kg.

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Q. The main product of high temperature carbonisation of coal is

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Q. High temperature carbonisation of coal takes place at __________ °C.

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Q. Removal of hydrogen from coke oven gas

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Q. If oxygen content in the flue gas rises too high, fuel is being wasted by

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Q. Increase in ash content of blast furnace coke

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Q. Safe condition for storage of high V.M. bituminous coal is that

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Q. Ignition temperature of a fuel in air is __________ that in pure oxygen.

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Q. Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

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Q. Which of the following has the least calorific value (kcal/Nm³) ?

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Q. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

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