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Fuels and Combustion

Fuels and Combustion
Calorific value of of blast furnace gas is around __________ KCal/Nm³.

4200
850
1800
6500

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Fuels and Combustion
Which of the following constituents of coal is the most important in the production of coke?

Moisture
Volatiles
Carbon
Ash

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Fuels and Combustion
Oxygen percentage (by weight) in atmospheric air is

23
29
21
19

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Fuels and Combustion
Which of the following is not applicable to fluidised bed combustion of coal?

Less heat transfer surface area is required in boilers
It can not burn low grade coal
It achieves higher fuel combustion efficiency
None of these

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Fuels and Combustion
Main constituent of natural gas is

H₂
CH₄ (upto 90%)
C₂H₆
C₃H₈

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

55 to 75
15 to 25
35 to 45
75

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