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Fuels and Combustion

Fuels and Combustion
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

Lower than
Not related to
Higher than
Same as

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

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

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

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Fuels and Combustion
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO, O₂, CO₂
O₂, CO₂, CO
CO₂, CO, O₂
CO₂, O₂, CO

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Fuels and Combustion
A coal with high __________ content, would ignite most easily.

Ash
Oxygen
Volatile matter
Fixed carbon

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Fuels and Combustion
Which is the heaviest fuel gas out of the following?

Water gas
Coke oven gas
Blast furnace gas
Carburetted water gas

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