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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Q. The combustion reaction, C + O₂ = CO₂, is

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Q. For maximum discharge through a chimney, its height should be

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Q. Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

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Q. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.

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Q. As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

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

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