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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?

Sewage gas
LPG
Producer gas
Natural gas

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Fuels and Combustion
Natural draught produced by a chimney depends upon the

Density of the chimney gases
Height of the chimney
Neither A nor B
Both A & B

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Fuels and Combustion
Calorific value as determined by bomb calorimeter is the

Gross calorific value at constant pressure
Lower calorific value at constant pressure
Higher calorific value at constant volume
Net calorific value at constant volume

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Fuels and Combustion
The maximum adiabatic flame temperature is attained, when the fuel is burnt with

Theoretically required amount of air
Less than theoretically required amount of air
Theoretically required amount of oxygen
More than theoretically required amount of air

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Fuels and Combustion
Which of the following coke has the least percentage of ash?

Foundary coke
Petroleum coke
Metallurgical coke
Beehive coke

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

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