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Fuels and Combustion

Fuels and Combustion
Fuel for a fast breeder nuclear reactor is

Radium
Uranium
Neptunium
Plutonium

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Fuels and Combustion
During the carbonisation of coal

Evolution of H₂ and formation of methane and aromatics occur at > 700°C
Hard semi-coke starts shrinking at 600°C
All of these
All tar is evolved at < 600°C

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Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

4
6
2
1

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Fuels and Combustion
In general, the limit of inflammability/explosion limit of fuel gases is widened by the

Increase in gas pressure
All of these
Increase in temperature (i.e. preheating)
Use of pure oxygen for combustion instead of air

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Fuels and Combustion
As the equilibrium moisture content of the coal increases, its

Swelling number decreases
Calorific value increases
Swelling number increases
Bulk density decreases

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Fuels and Combustion
Coal is pulverised before burning in large capacity boiler furnaces mainly to

Enhance its calorific value
Provide trouble free operation
Ensure its complete combustion
Facilitate easy ash removal

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