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Fuels and Combustion

Fuels and Combustion
__________ has the widest inflammability limit (explosion limit) of all the gases.

Carbon monoxide
Acetylene
Hydrogen
Methane

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Fuels and Combustion
Most of the coking coals are

Bituminous
Lignite
Anthracite
None of these

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Fuels and Combustion
Out of the following, which is the most important parameter for the blast furnace grade coke?

Ash content
Volatile matter content
Moisture content
CSR & CRI

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Fuels and Combustion
Softening temperature of coal ash is a measure of the __________ of coal.

Caking tendency
Size stability
Clinkering tendency
Coking tendency

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Fuels and Combustion
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

5000
50
10000
1000

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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
Unpredictable
1

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