Fuels and Combustion
Narrow coke ovens as compared to wider coke ovens

Produce smaller coke
Produce stronger coke
All of these
Require less time of carbonisation

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Fuels and Combustion
Lignite is

A coking coal
Can be used for gasification and steam generation
A black banded coal which burns with a non-smoky yellowish flame
A high rank coal

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

All of these
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
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber
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

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