Fuels and Combustion In general, the limit of inflammability/explosion limit of fuel gases is widened by the Use of pure oxygen for combustion instead of air Increase in temperature (i.e. preheating) Increase in gas pressure All of these Use of pure oxygen for combustion instead of air Increase in temperature (i.e. preheating) Increase in gas pressure All of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Oxygen percentage (by weight) in atmospheric air is 21 19 23 29 21 19 23 29 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Ignition temperature decreases progressively from anthracite to lignite, because Volatile matter content increases Moisture content increases Carbon content decreases Ash content increases Volatile matter content increases Moisture content increases Carbon content decreases Ash content increases ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Ratio of primary air to secondary air increases with increase in the rank of coal, because the Ratio of fixed carbon to volatile matter increases Oxygen content progressively decreases High rank coals have higher amount of volatile matter Calorific value of the coal increases Ratio of fixed carbon to volatile matter increases Oxygen content progressively decreases High rank coals have higher amount of volatile matter Calorific value of the coal increases ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion During combustion of coal on grate, clinker formation is increased by the Use of thick fire bed All of these Low fusion point of ash (< 1100° C) Use of preheated primary air Use of thick fire bed All of these Low fusion point of ash (< 1100° C) Use of preheated primary air ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The cooling medium used in dry quenching of coke is Phenolic water Carbon dioxide Air Nitrogen Phenolic water Carbon dioxide Air Nitrogen ANSWER DOWNLOAD EXAMIANS APP
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