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FUELS AND COMBUSTION

Fuels and Combustion
Which of the following has the least calorific value (kcal/Nm³) ?

Natural gas
Coke oven gas
Blast furnace gas
Sewage gas

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Fuels and Combustion
Caking index of coal blend used for blast furnace coke making is about

8
22
36
12

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

Volatiles
Moisture
Iron
Ash

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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

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

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Fuels and Combustion
A coal containing high amount of volatile matter will have

Low ignition temperature
Low adiabatic flame temperature
High fusion point of its ash
Very little ash content

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