Q. Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

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Q. As time passes, the calorific value of stored coal

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Q. Stack (chimney) height in a big thermal power plant is dictated by the

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Q. A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

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Q. A travelling grate stoker is meant for the efficient burning of __________ coal.

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Q. Pick out the wrong statement.

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Q. Percentage of carbon monoxide in blast furnace gas may be around

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Q. The main drawback of supplying more excess air in the combustion of fuel is the

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Q. Width of the coke oven towards coke side is slightly more than that on pusher side to

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Q. Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?

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Q. High rate of heating of coke ovens

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Q. A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

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Q. Coalification means the

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Q. Hard coke is manufactured from

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Q. In low temperature carbonisation of coal, the

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Q. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

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Q. Coking time in narrow by-product coke ovens is around __________ hours.

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Q. Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.

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

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Q. Gray-King Assay and Roga Index of coal is a measure of its

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