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Fuels and Combustion

Fuels and Combustion
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1350
1400
1250
1100

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Fuels and Combustion
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is

12.5
20
10
0

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Fuels and Combustion
Junker's calorimeter is used to determine the calorific value of

Gaseous fuels
Fuel oil
Pulverised coal
None of these

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Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

20
96
40
4

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Fuels and Combustion
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

< 1
1
> 1
Unpredictable

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

Five
Two
Four
Six

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