Q. "Overfire burning" in a furnace is a phenomenon characterised by the

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Q. Yield of pitch from distillation of high temperature tar is around __________ percent.

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Q. Fuel consumption in coke making can be reduced by

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Q. During combustion of coal on grate, clinker formation is increased by the

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Q. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be

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Q. With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

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Q. Which of the following is the maximum coal producing state in India ?

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Q. Height of coke oven is limited (say maximum upto 7 metres) mainly by the

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Q. Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

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Q. The hottest part of the flame lies in its____zone.

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Q. Presence of free moisture in coal is most disadvantageous during

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Q. The heat of combustion of a fuel

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Q. High excess air in combustion of fuels results in

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Q. Abrasion index of blast furnace coke should be around __________ percent.

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Q. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

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Q. The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³.

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Q. Washing of coal decreases its

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Q. Which of the following petrographic constituents of coal is non-coking ?

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Q. __________ has the widest inflammability limit (explosion limit) of all the gases.

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Q. Percentage of methane in coke oven gas may be around

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