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Fuels and Combustion

Fuels and Combustion
Fuel for a fast breeder nuclear reactor is

Plutonium
Radium
Neptunium
Uranium

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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
Chances of clinker formation
Risk of explosion
Incomplete combustion of coal

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Fuels and Combustion
Producer gas comprises mainly of

CO & H₂
CO & N₂
CO₂ & N₂
CO₂ & H₂

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Fuels and Combustion
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

80 and 97
40 and 70
95 and 100
25 and 97

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Fuels and Combustion
Which of the following accounts for maximum energy loss in a boiler?

Flue gases
Ash content in the fuel
Unburnt carbon in flue gases
Incomplete combustion

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Fuels and Combustion
In high temperature carbonisation (as compared to low temperature carbonisation) of coal

Coke oven gas yield is more
All of these
Calorific value of coke oven gas is less
Tar yield is less but free carbon in tar is more

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