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Fuels and Combustion

Fuels and Combustion
Efficient burning of anthracite coal requires

High excess air
All of these
Low preheat of air
Fine grinding

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Fuels and Combustion
High temperature in gasification of coal favours

High production of CO
Both B and C
High production of CO₂
Low production of CO₂

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Fuels and Combustion
Which of the following gaseous fuels has the lowest calorific value?

Blast furnace gas
Converter gas
Refinery gas
Gobar gas

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Fuels and Combustion
The main function of primary air in pulverised coal fired burner is to

Preheat the tertiary air used for complete combustion of CO to CO₂
Have proper combustion by supplying it around the burner
Burn CO to CO₂
Dry and transport the coal

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Fuels and Combustion
Coke oven gas is stripped of its H₂S and mercaptans content by

Bubbling it through dilute sulphuric acid
Adsorption on silica gel
Absorption in wash oil
Adsorption on bog iron bed

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Fuels and Combustion
Air/gas ratio for complete combustion will be the highest for

Carburetted water gas
LPG
Gobar gas
Coke oven gas

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