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Fuels and Combustion

Fuels and Combustion
Highly reactive coke have lower

Critical air blast (CAB) value
Coke reactivity index (CRI)
Both B and C
Porosity

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Fuels and Combustion
Stack heat losses can be minimised by

Using low c.v. fuels
Controlling the excess air
Maintaining proper draft in the furnace
Oxygen enrichment of combustion air

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Fuels and Combustion
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

MgSO₄ & BaCl₂
BaSO₄ & NaCl
MgCO₃ & NaCl
MgO & Na₂CO₃

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Fuels and Combustion
Combustion of pulverised coal as compared to that of lump coal

Develops a non-luminous flame
Can be done with less excess air
Develops a low temperature flame
Provides a lower rate of heat release

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Fuels and Combustion
Carbon Content by weight in air dried wood may be about __________ percent.

80
50
25
10

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Fuels and Combustion
As the equilibrium moisture content of the coal increases, its

Calorific value increases
Bulk density decreases
Swelling number increases
Swelling number decreases

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