Fuels and Combustion
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

Both A & B
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Because, it alone produces unreactive coke
Neither A nor B

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Fuels and Combustion
Orsat apparatus is meant for

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

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