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Fuels and Combustion

Fuels and Combustion
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

2
10
5
0.1

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

Classified
Carbonised
Caking
Non-caking

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Fuels and Combustion
Coke oven gas constitutes mainly of

H₂ & CO₂
H₂ & CH₄
H₂ & CO
CH₄ & CO

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Fuels and Combustion
Low temperature oxidation of coal is accelerated by the

Absence of porous or friable particles
All of these
Storage in compressed piles
Storage in large heaps

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Fuels and Combustion
A good metallurgical coke should have very low

Sulphur & phosphorous content
Porosity
Fusion point of its ash
Hardness & strength

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Fuels and Combustion
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.

25
50
75
10

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