Fuels and Combustion The weathering index of a coal Is related to its calorific value Is a measure of its caking tendency Is a measure of its size stability, when stored & exposed to weather Gives an idea of the fusion temperature of ash Is related to its calorific value Is a measure of its caking tendency Is a measure of its size stability, when stored & exposed to weather Gives an idea of the fusion temperature of ash ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Pick the odd man out. Pitch creosote mixture Briquettes Oil gas Wood Pitch creosote mixture Briquettes Oil gas Wood ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion High rate of heating of coke ovens None of these Increases the time of carbonisation May damage its walls due to abrupt excessive swelling of coal Produces larger size coke None of these Increases the time of carbonisation May damage its walls due to abrupt excessive swelling of coal Produces larger size coke ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Blast furnace gas compared to coke oven gas has Narrower limit of inflammability Higher calorific value Lower ignition temperature Lower theoretical flame temperature Narrower limit of inflammability Higher calorific value Lower ignition temperature Lower theoretical flame temperature ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion During the carbonisation of coal All tar is evolved at < 600°C Hard semi-coke starts shrinking at 600°C Evolution of H₂ and formation of methane and aromatics occur at > 700°C All of these All tar is evolved at < 600°C Hard semi-coke starts shrinking at 600°C Evolution of H₂ and formation of methane and aromatics occur at > 700°C All of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The fuel ratio of a coal is Both A and B The ratio of its percentage of fixed carbon to that of volatile matter Helpful in estimation of its rank Neither A nor B Both A and B The ratio of its percentage of fixed carbon to that of volatile matter Helpful in estimation of its rank Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
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