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Fuels and Combustion

Fuels and Combustion
High pressure coal gasification is employed in __________ process.

Winkler
Lurgi
None of these
Kopper-Totzek

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Fuels and Combustion
Advantages of fluidised bed combustion are

Reduced NOx formation in flue gas
Lower furnace operating temperature
High heat transfer rate
All of these

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Fuels and Combustion
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

Fine sizes without the presence of any lump
Large heaps with small surface to volume ratio
Shallow and small piles
Closed space without any ventilation facility

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Fuels and Combustion
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

N₂
CH₄
CO₂
H₂

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Fuels and Combustion
Pulverised coal used in boiler firing need not have

High fusion point of its ash
Lower ash content
Less moisture content
High bulk density

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Fuels and Combustion
For long flame and easy ignition, the coal used should have

Low ash
High calorific value
High volatile matter
High ash

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