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Fuels and Combustion

Fuels and Combustion
Fuel combustion is never cent per cent efficient due to

Incomplete combustion
Dry gas/stack gas loss
Moisture loss
All of these

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

55 to 75
35 to 45
15 to 25
75

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Fuels and Combustion
The gas which contributes maximum to the heating value of natural gas is

H₂
CH₄
CO
CO₂

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Fuels and Combustion
Dry air required to burn 1 kg of carbon completely may be around __________ kg.

20
11
38
2

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Fuels and Combustion
In low temperature carbonisation (as compared to high temperature carbonisation) of coal

All of these
Free carbon in tar is more
Ammonia yield is more
Aliphatic tar is produced

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Fuels and Combustion
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

Less air for combustion
Pulverised coal in boilers
Too much air for combustion
Correct amount of air for combustion

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