121. Dust content in raw blast furnace gas is about __________ gm/Nm3, hence it is cleaned to the dust level of about < 10 mg/Nm3 before use.
122. Coke oven gas is a better fuel than blast furnace gas, because of its higher
123. The main advantage of forced draft over natural draft is that
124. A particular coal is said to be free burning when it
125. Main constituents of benzol are
126. A coal containing very high percentage of durain is called __________ coal.
127. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
128. Grindability index of a coal is 100. It implies that the
129. Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
130. The reaction, C + CO2 ⟷ 2CO, taking place during coal gasification is called the __________ reaction.
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