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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Q. Calorific value as determined by bomb calorimeter is the

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Q. Fixed carbon in coal is defined as

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Q. Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?

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Q. With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

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Q. During its calorific value determination by bomb calorimeter, coal is combusted by

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Q. Abel apparatus is used for those oils, whose flash points are___°F.

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Q. Quantity of coke produced from metallurgical coal may be around __________ percent.

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Q. Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

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