81. Pick out the wrong statement.
82. Low temperature carbonisation of coal takes place at __________ °C.
83. High temperature carbonisation of coal takes place at __________ °C.
84. Actual flame temperature is always lower than the adiabatic flame temperature, because there is
85. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always
86. Sometimes water is sprayed during coal charging in the coke oven, which helps in
87. The main drawback of supplying more excess air in the combustion of fuel is the
88. Which of the following fuel gases has the highest calorific value ?
89. Which of the following has the highest calorific value?
90. Which of the following coke has the least percentage of ash?
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