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Fuels and Combustion

Fuels and Combustion
Caking coal is desirable for

Coke making
Burning on firebars
Burning on travelling grate
All of these

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Fuels and Combustion
Calorific value of bituminous coal may be around __________ Kcal/kg.

6500
500
1500
20000

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Fuels and Combustion
Preheating of combustion air is done to

Increase the calorific value of the fuel
Increase the adiabatic flame temperature
Reduce its requirement for effecting the complete combustion
Complete the combustion of fuel

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Fuels and Combustion
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

Requirement of large volume combustion chamber
Incomplete combustion of coal
Risk of explosion
Chances of clinker formation

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Fuels and Combustion
Carbon Content by weight in air dried wood may be about __________ percent.

10
25
50
80

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Fuels and Combustion
Catalyst used in Fischer-Tropsch process is

Nickel
Zinc oxide
Thorium oxide
Alumina

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