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Fuels and Combustion

Fuels and Combustion
Pick the odd man out.

Wood
Oil gas
Briquettes
Pitch creosote mixture

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

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

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Fuels and Combustion
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

Smaller fines are stored in large quantity
It is stored in tall heaps
It contains large amount of volatile matter
All of these

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Fuels and Combustion
Higher fuel combustion efficiency can not be achieved by

Supplying correct amount of combustion air
Reducing sulphur content in the fuel
Adopting proper fuel firing technique & fuel preparation
Preheating of fuel gases & combustion air

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Fuels and Combustion
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

Pitch
Bituminous coal
Fuel oil
Blast furnace gas

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Fuels and Combustion
Quantity of coke produced from metallurgical coal may be around __________ percent.

95
50
75
30

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