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Fuels and Combustion

Fuels and Combustion
Which of the following has the highest calorific value?

Anthracite
Lignite
Sub-bituminous coal
Peat

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Fuels and Combustion
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

May increase or decrease depending on the type of fuel
Remains same
Decreases
Increases

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

Decreases
Increases
None of these
Remains constant

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

Acetylene
Carbon monoxide
Methane
Hydrogen

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Fuels and Combustion
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about

Same as that of coal middling
25000 kcal/kg
8800 kcal/kg
8800 kcal/m³

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Fuels and Combustion
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

Complete combustion
Incomplete combustion
High oxygen in flue gas
None of these

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