Q. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and

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Q. Spontaneous combustion of coal on storage results due to

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Q. High temperature carbonisation of coal produces

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Q. Which of the following is the most poisonous gas ?

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Q. Bomb calorimeter can be used to determine the __________ of the coal.

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Q. Which of the following is a poisonous fuel gas?

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Q. In low temperature carbonisation (as compared to high temperature carbonisation) of coal

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Q. Washing of coal does not reduce its

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Q. Coke having higher porosity has

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Q. Calorific value of coke oven gas is around __________ Kcal/Nm³.

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Q. Highly caking coals

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Q. Main use of hard coke produced by high temperature carbonisation is in the

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Q. Hard pitch is used for making

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Q. Supply of excess air for complete combustion of fuel is necessitated to facilitate

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Q. A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

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Q. Combustion of pulverised fuel

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Q. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

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Q. Low temperature oxidation of coal during storage does not decrease its

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Q. With increase in the oxygen content of the coal, its __________ decreases.

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Q. Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?

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