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Fuels and Combustion

Fuels and Combustion
Which of the following has the highest heat of combustion?

CO
C₂H₆
CH₄
H₂

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Fuels and Combustion
A coal that softens and fuses on heating is

Non-caking
Caking
Carbonised
Classified

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Fuels and Combustion
During coking of coal, the ash content (percentage)

Remains constant
None of these
Decreases
Increases

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Fuels and Combustion
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

Wet scrubber
Hydrocyclones
Multicyclones
Bag filter

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Fuels and Combustion
Which of the following combustibles is absent in blast furnace gas?

CO
H₂
CH₄
None of these

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

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

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