Fuels and Combustion Spontaneous combustion of coal on storage results due to All of these Low temperature oxidation Storage in large heaps with small surface to volume ratio Inadequate ventilation All of these Low temperature oxidation Storage in large heaps with small surface to volume ratio Inadequate ventilation 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 Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as M = A M = 1.1 A M = 0.5 A M = 1.8 A M = A M = 1.1 A M = 0.5 A M = 1.8 A ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Gobar gas constitutes mainly of CO & N₂ CH₄ & N₂ CO & CO₂ CH₄ & CO₂ CO & N₂ CH₄ & N₂ CO & CO₂ CH₄ & CO₂ ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Combustion of pulverised coal as compared to that of lump coal Provides a lower rate of heat release Develops a low temperature flame Can be done with less excess air Develops a non-luminous flame Provides a lower rate of heat release Develops a low temperature flame Can be done with less excess air Develops a non-luminous flame ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The heat of combustion of a fuel Is always negative Is equal to the heat of formation Can't be known without calculating it Is always positive Is always negative Is equal to the heat of formation Can't be known without calculating it Is always positive ANSWER DOWNLOAD EXAMIANS APP
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