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Fuels and Combustion

Fuels and Combustion
Which of the following has the highest calorific value (kcal/Nm³) ?

Gobar gas
Natural gas
LPG
Carburetted water gas

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Fuels and Combustion
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain

CO
H₂O
CO₂
Both B & C

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

Peat
Anthracite
Sub-bituminous coal
Lignite

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Fuels and Combustion
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

None of these
In between 37 & 71%
< 37%
>71%

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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

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

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Fuels and Combustion
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

25 and 97
80 and 97
95 and 100
40 and 70

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