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Fuels and Combustion

Fuels and Combustion
Hard pitch is used for making

Plastics
Pulverised fuel
Insecticides
Perfumes

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

CO
CO₂
CH₄
H₂

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Fuels and Combustion
Ignition temperature decreases progressively from anthracite to lignite, because

Ash content increases
Volatile matter content increases
Carbon content decreases
Moisture content increases

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Fuels and Combustion
Preheating of __________ the flame temperature.

The gaseous fuel before combustion decreases
Either the fuel or the air or both, increases
Either the fuel or the air does not affect
Combustion air decreases

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Fuels and Combustion
Number of macrocomponents present in coal according to Stopes are

Two
Four
Six
Five

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Fuels and Combustion
About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.

1
3
2
5

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