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Fuels and Combustion

Fuels and Combustion
Catalyst used in Fischer-Tropsch process is

Zinc oxide
Alumina
Thorium oxide
Nickel

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Fuels and Combustion
Ionisation potential applied across the electrodes of electrostatic tar precipitator is around

60 KV AC
230 V AC
60 KV DC
230 V DC

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

Ignition temperature of coke produced is less
Aromatic content of tar produced is more
Gas yield is less
Tar yield is more

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Fuels and Combustion
When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.

Gasification
Coalification
Carbonisation
Oxidation

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Fuels and Combustion
Actual flame temperature is always lower than the adiabatic flame temperature, because there is

Both A & B
Neither A nor B
No possibility of obtaining complete combustion at high temperature
Always loss of heat from the flame

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Fuels and Combustion
Preheating of a gaseous fuel results in increased

Flame length
Ignition temperature
Flame temperature
Quantity of flue gas

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