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FUELS AND COMBUSTION

Fuels and Combustion
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

CO₂
N₂
H₂
CH₄

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Fuels and Combustion
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.

Oxygen
Carbon
Hydrogen
Sulphur

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Fuels and Combustion
Insitu theory and drift theory are related to the

Variation of coal quality with depth
Origin of coal
Origin of petroleum oil
Coalification

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Fuels and Combustion
During the carbonisation of coal

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

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Fuels and Combustion
Which of the following is not a micro component present in coal?

Clarain
Liptinite
Fusinite
Micrinite

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