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Fuels and Combustion

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

15 to 25
75
35 to 45
55 to 75

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Fuels and Combustion
Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

18
6
12
24

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Fuels and Combustion
High sulphur content in a fuel __________ of the flue gases.

Decreases the dew point
Both B & C
Increases the dew point
Reduces the combustion efficiency by limiting the permissible temperature reduction

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Fuels and Combustion
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

None of these
Back draughting
Under pressurising
Banking

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

1800
4200
6500
850

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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

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

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