Fuels and Combustion Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³. 1800 3200 5400 10200 1800 3200 5400 10200 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion As the equilibrium moisture content of the coal increases, its Calorific value increases Swelling number increases Swelling number decreases Bulk density decreases Calorific value increases Swelling number increases Swelling number decreases Bulk density decreases ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion High temperature in gasification of coal favours High production of CO High production of CO₂ Both B and C Low production of CO₂ High production of CO High production of CO₂ Both B and C Low production of CO₂ ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Presence of free moisture in coal is most disadvantageous during Handling (e.g. when emptying wagons) None of these Combustion of fire slacks on the grates Its pulverisation (as it requires more power) Handling (e.g. when emptying wagons) None of these Combustion of fire slacks on the grates Its pulverisation (as it requires more power) ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion A coal having high volatile matter content will None of these Give less yield of tar and gas on carbonisation Burn with a small non-smoky flame Have a very high calorific value None of these Give less yield of tar and gas on carbonisation Burn with a small non-smoky flame Have a very high calorific value ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following would require least amount of secondary air for combustion? Anthracite containing 10% volatile matter and 8% ash Coke breeze containing 25% ash and 2% volatile matter Semi-bituminous coal containing 25% ash and 20% volatile matter Bituminous coal containing 20% ash and 25% volatile matter Anthracite containing 10% volatile matter and 8% ash Coke breeze containing 25% ash and 2% volatile matter Semi-bituminous coal containing 25% ash and 20% volatile matter Bituminous coal containing 20% ash and 25% volatile matter ANSWER DOWNLOAD EXAMIANS APP
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