Fuels and Combustion
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Methane
Hydrogen
Unsaturated hydrocarbons
All of these

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Fuels and Combustion
Anthracite coal

Contains more volatile matter than bituminous coal
Burns with short, bluish, yellow-tipped flame producing very little smoke
Is essentially a coking coal
Ignites more easily than bituminous coal

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Fuels and Combustion
Low temperature carbonisation

Produces higher quantity of gas than high temperature carbonisation
Is meant for the production of 'metallurgical coke'
Produces less quantity of tar than high temperature carbonisation
Is mainly for producing the smokeless domestic coke

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Fuels and Combustion
A coal with high ash content is undesirable, as

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber
The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the
All of these

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