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Fuels and Combustion

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.

1400
1100
1350
1250

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Fuels and Combustion
Most of the coking coals are

Anthracite
Lignite
None of these
Bituminous

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Fuels and Combustion
Which of the following is not a by-product fuel?

Blast furnace gas
Refinery gas
Pitch
Petrol

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Fuels and Combustion
Spontaneous combustion of coal on storage results due to

All of these
Storage in large heaps with small surface to volume ratio
Low temperature oxidation
Inadequate ventilation

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Fuels and Combustion
Function of secondary air in pulverised coal firing is to

Dry the coal
Transport the coal to the burner
Ensure efficient burning of coal around the burner
Reduce primary air requirement

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Fuels and Combustion
Largest constituent of blast furnace gas is

H₂
N₂
CO
CO₂

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