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Fuels and Combustion

Fuels and Combustion
A coal that softens and fuses on heating is

Caking
Classified
Carbonised
Non-caking

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Fuels and Combustion
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.

120
65
30
180

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Fuels and Combustion
Which of the following constituents of coal is the most important in the production of coke?

Moisture
Volatiles
Ash
Carbon

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

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

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Fuels and Combustion
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

O₂, CO₂, CO
CO₂, O₂, CO
CO₂, CO, O₂
CO, O₂, CO₂

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Fuels and Combustion
During combustion of gaseous fuels, deficiency of air

Does not affect the flame length
Lengthens the flame
Tends to shorten the flame
Increases the flame temperature

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