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 It reduces its flame temperature tremendously There are chances of explosion during preheating The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot It reduces its calorific value tremendously It reduces its flame temperature tremendously There are chances of explosion during preheating The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Producer gas containing least amount of tar is produced by the Partial combustion of large size (< 50 mm) coke Partial combustion of coal Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier) High pressure gasification of coal (e.g. in Lurgi gasifier) Partial combustion of large size (< 50 mm) coke Partial combustion of coal Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier) High pressure gasification of coal (e.g. in Lurgi gasifier) ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Supply of excess air for complete combustion of fuel is necessitated to facilitate Its thorough mixing with air Attainment of chemical equilibrium None of these Attainment of high temperature Its thorough mixing with air Attainment of chemical equilibrium None of these Attainment of high temperature ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Coking time in beehive coke oven is about Two weeks 12 hours One week 2-3 days Two weeks 12 hours One week 2-3 days ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be More Less Same Data insufficient; can't be predicted More Less Same Data insufficient; can't be predicted ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following is a rich fuel gas? Refinery gases Producer gas None of these Coal gas from underground gasification of coal Refinery gases Producer gas None of these Coal gas from underground gasification of coal ANSWER DOWNLOAD EXAMIANS APP
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