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Fuels and Combustion

Fuels and Combustion
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.

1800
3200
5400
10200

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Fuels and Combustion
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

1100
500
750
950

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Fuels and Combustion
The cooling medium used in dry quenching of coke is

Air
Carbon dioxide
Phenolic water
Nitrogen

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Fuels and Combustion
Combustion reaction of fuels is a/an __________ reaction.

Endothermic
Exothermic
None of these
Auto catalytic

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Fuels and Combustion
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

15 to 25
55 to 75
75
35 to 45

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Fuels and Combustion
Higher percentage of ash in coal meant for the production of metallurgical grade coke

Causes brittleness in steel
Decreases the abrasion resistance of coke
Decreases the hardness of coke
None of these

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