Fuels and Combustion

171.Fusion point of coal ash increases with increase in its _________ content.

1. Iron sulphate
2. Iron silicate
3. Lime and magnesia
4. All (A), (B) and (C)

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172.Fussain

1. Is friable, charcoal like substance
2. Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
3. Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
4. All (A), (B) and (C)

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173.Gas yield in the Kopper-Totzek coal gasifier is about _________ Nm³/ton coal (ash = 35%).

1. 150
2. 1500
3. 3500
4. 5000

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174.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.

1. 400-500
2. 900-1000
3. 1400-1500
4. 1700-1800

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175.Gobar gas constitutes mainly of

1. CH₄ & CO₂
2. CO & CO₂
3. CH₄ & N₂
4. CO & N₂

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176.Gobar gas is produced by the _________ of 'gobar' (cow dung).

1. Hydrolysis
2. Fermentation
3. Oxidation
4. Dehydration

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177.Gobar gas is produced by the _________ of cow dung.

1. Fermentation
2. Oxidation
3. Hydrogenation
4. None of these

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178.Gray King Assay and Swelling Index of a coal is a measure of its

1. Swelling characteristics
2. Abradability
3. Agglutinating properties
4. Resistance to impact breakage

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179.Grindability index of a coal is 100. It implies that the

1. Coal can be pulverised with great difficulty
2. Coal can't be pulverised
3. Coal can be easily pulverised
4. Power consumption in grinding the coal will be very high

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180.Gross & net calorific value is the same for

1. Blast furnace gas
2. Coke oven gas
3. L.D. converter gas
4. None of these

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