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Fuels and Combustion

Fuels and Combustion
Low temperature oxidation of coal during storage does not decrease its

Calorific value
None of these
Oxygen content
Caking power

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Fuels and Combustion
In low temperature carbonisation of coal, the

Temperature maintained is 700°C
Yield of tar is about 3% of dry coal
Yield of coke oven gas is 290 Nm³ /ton dry coal
Volatile matter in coke is zero

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Fuels and Combustion
The advantage of firing pulverised coal in the furnace lies in the fact, that it

Permits the use of high ash content coal
Accelerates the burning rate and economises on fuel combustion
Permits the use of low fusion point ash coal
All of these

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Fuels and Combustion
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about

8800 kcal/kg
25000 kcal/kg
8800 kcal/m³
Same as that of coal middling

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Fuels and Combustion
Desirable "Micum Index" values of metal-lurical coke are

M40 > 4% and M10 < 80%
M40 > 98% and M10 < 2%
M40 > 78% and M10 < 10%
M40 > 10% and M10 < 78%

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Fuels and Combustion
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

5 to 15
3 to 4
20 to 40
1 to 2

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