Fuels and Combustion
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

Coke oven battery heating
Mixing with blast furnace gas
Hot scarfing of steel slabs
Steel ladle drying

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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
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

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Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

High rank coals have higher amount of volatile matter
Oxygen content progressively decreases
Calorific value of the coal increases
Ratio of fixed carbon to volatile matter increases

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Fuels and Combustion
Orsat apparatus is meant for

Gravimetric analysis of flue gas
None of these
Finding out combustion efficiency
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

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