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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Q. Which of the following has the highest calorific value ?

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Q. __________ present in coal is not determined in its ultimate analysis.

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Q. The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .

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Q. __________ prohibits the use of alcohols directly in petrol engines.

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Q. Higher fuel combustion efficiency can not be achieved by

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Q. Softening temperature of coal ash is a measure of the __________ of coal.

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Q. A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

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