Fuels and Combustion
Height of coke oven is limited (say maximum upto 7 metres) mainly by the

Structural strength of silica bricks
Problem in door cleaning
Problem of uniform heating along its height
Buckling of ram of pusher car at the time of coke pushing

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Fuels and Combustion
Which of the following would require least amount of secondary air for combustion?

Bituminous coal containing 20% ash and 25% volatile matter
Anthracite containing 10% volatile matter and 8% ash
Coke breeze containing 25% ash and 2% volatile matter
Semi-bituminous coal containing 25% ash and 20% volatile matter

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