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Fuels and Combustion

Fuels and Combustion
The gas which contributes maximum to the heating value of natural gas is

CO₂
CH₄
H₂
CO

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Fuels and Combustion
Coalification means the

Complete combustion of coal
Underground gasification of coal
Process of conversion of lignite into anthracite
Direct hydrogenation of coal

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

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

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Fuels and Combustion
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

10 & 3
15 & 8
3 & 10
10 & 20

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Fuels and Combustion
Low temperature oxidation of coal during storage does not decrease its

Caking power
Oxygen content
Calorific value
None of these

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Fuels and Combustion
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

Colour of
% of O₂in
Temperature of
%of CO₂ in

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