Fuels and Combustion Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because It reduces its calorific value tremendously The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot There are chances of explosion during preheating It reduces its flame temperature tremendously It reduces its calorific value tremendously The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot There are chances of explosion during preheating It reduces its flame temperature tremendously ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ? Propane and acetylene Propane and LPG Sewage gas and gobar gas F. gas and coke oven gas Propane and acetylene Propane and LPG Sewage gas and gobar gas F. gas and coke oven gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent. 5 75 25 55 5 75 25 55 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Ignition temperature decreases progressively from anthracite to lignite, because Ash content increases Volatile matter content increases Carbon content decreases Moisture content increases Ash content increases Volatile matter content increases Carbon content decreases Moisture content increases ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion In low temperature carbonisation of coal, the Temperature maintained is 700°C Volatile matter in coke is zero Yield of coke oven gas is 290 Nm³ /ton dry coal Yield of tar is about 3% of dry coal Temperature maintained is 700°C Volatile matter in coke is zero Yield of coke oven gas is 290 Nm³ /ton dry coal Yield of tar is about 3% of dry coal ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Fusion point of coal ash increases with increase in its __________ content. Iron silicate Lime and magnesia All of these Iron sulphate Iron silicate Lime and magnesia All of these Iron sulphate ANSWER DOWNLOAD EXAMIANS APP
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