Fuels and Combustion

471.Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

1. Decolourisation of sugar
2. Solvent recovery from air and gases
3. Absorption of gases and vapor
4. Electrode manufacture

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472.Yield of blast furnace gas is about _________ Nm³ /ton of pig iron.

1. 300
2. 2000
3. 5000
4. 10000

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473.Yield of charcoal in high temperature carbonisation of wood is about _________ percent.

1. 10
2. 25
3. 50
4. 75

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474.Yield of coke oven gas in low temperature carbonisation of coal is about _________ Nm³ /ton of dry coal.

1. 60
2. 160
3. 500
4. 750

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475.Yield of pitch from distillation of high temperature tar is around _________ percent.

1. 10
2. 25
3. 65
4. 90

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