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Fuels and Combustion

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

18
24
6
12

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Fuels and Combustion
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

Yield percentage of coke
Yield of ammonia present in coke oven gas
Free carbon content in tar
Difference in gross & net calorific value of the coke oven gas

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Fuels and Combustion
Low temperature carbonisation of coal produces

Soft coke
No by-products
Metallurgical coke
Very low calorific value coke oven gas

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Fuels and Combustion
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

Density
None of these
Electrical resistivity
Porosity

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Fuels and Combustion
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

< 1
1
> 1
Unpredictable

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Fuels and Combustion
__________ is used as jet engine fuel.

LPG
Petrol
Kerosene
Diesel

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