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Fuels and Combustion

Fuels and Combustion
During coking of coal, the ash content (percentage)

Remains constant
None of these
Increases
Decreases

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Fuels and Combustion
Which of the following coke has the least percentage of ash?

Beehive coke
Metallurgical coke
Foundary coke
Petroleum coke

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Fuels and Combustion
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1250
1100
1400
1350

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Fuels and Combustion
In Lurgi coal gasifier,

Coking coals cannot be used
Low carbon conversion efficiency is achieved
Larger quantity of coal can be processed
Entrainment of solids is higher

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Fuels and Combustion
Which of the following is the most poisonous gas?

Coke oven gas
Blast furnace gas
Producer gas
L.D. converter gas

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Fuels and Combustion
Removal of hydrogen from coke oven gas

Decreases its calorific value
Does not alter its calorific value
Is not possible on commerical scale
Increases its calorific value

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