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Fuels and Combustion

Fuels and Combustion
Which of the following gaseous fuels is likely to have the highest gross calorific value?

Producer gas
LPG
Natural gas
Sewage gas

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Fuels and Combustion
Softening temperature of coal ash is a measure of the __________ of coal.

Caking tendency
Size stability
Coking tendency
Clinkering tendency

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Fuels and Combustion
Purity of coke means that, it is high in carbon and low in

Volatiles
Iron
Ash
Moisture

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Fuels and Combustion
The advantage of firing pulverised coal in the furnace lies in the fact, that it

Permits the use of high ash content coal
All of these
Accelerates the burning rate and economises on fuel combustion
Permits the use of low fusion point ash coal

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Fuels and Combustion
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

Water gas
Natural gas
Blast furnace gas
Coke oven gas

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Fuels and Combustion
Critical Air Blast (CAB) value of coke is a direct measure of its

Hardness
Reactivity
None of these
Strength

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