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Fuels and Combustion

Fuels and Combustion
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

80 and 97
25 and 97
95 and 100
40 and 70

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Fuels and Combustion
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Calorific value
Yield of carbonised products
Caking index
Friability & oxygen content

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Fuels and Combustion
Presence of force moisture in coal is most disadvantageous during its

Washing
Transportation and handling
Storage
Pulverisation

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Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Higher methane content and thus higher calorific value
Lower carbon dioxide content
Higher carbon monoxide content
None of these

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Fuels and Combustion
The gas which contributes maximum to the heating value of natural gas is

H₂
CO
CO₂
CH₄

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Fuels and Combustion
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.

Fixed
Entrained
Fluidised
Moving

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