Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Higher methane content and thus higher calorific value
Higher carbon monoxide content
None of these
Lower carbon dioxide content

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

All of these
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content
Methane content in the coke oven gas decreases and carbon monoxide content increases

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