Q. Froth floatation is used for

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Q. (64-132) rank coal (ASTM) means a coal with 64%

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Q. The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

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Q. Which of the following is not a 'manufactured' fuel ?

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Q. Use of excess of combustion air in the combustion of fuels results in

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Q. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?

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Q. Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

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Q. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

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Q. The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be

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Q. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

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Q. One kg of carbon for theoretically complete combustion requires __________ kg of air.

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Q. If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

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Q. By-products are __________ recovered in 'Beehive ovens'.

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Q. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?

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

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Q. Function of secondary air in pulverised coal firing is to

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Q. Calorific value of dry wood may be around __________ Kcal/kg.

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Q. Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.

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Q. When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.

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Q. Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.

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