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Fuels and Combustion

Fuels and Combustion
Hard pitch is used for making

Pulverised fuel
Perfumes
Plastics
Insecticides

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Fuels and Combustion
Pulverised coal used in boiler firing need not have

High bulk density
Less moisture content
High fusion point of its ash
Lower ash content

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

CH₄
N₂
H₂
CO₂

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Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

950
550
750
1150

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Fuels and Combustion
Low temperature oxidation of stored coal results in the

Decrease in its caking power & calorific value
Decrease in its carbon & hydrogen content
Increase in its oxygen content
All of these

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Fuels and Combustion
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?

Ethylene
Napthalene
Benzol
Pitch-cresosote mixture (PCM)

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