Fuels and Combustion Blast furnace coke is made from coal by Medium temperature carbonisation High temperature carbonisation Heating the coal in an oven in presence of air Low temperature carbonisation Medium temperature carbonisation High temperature carbonisation Heating the coal in an oven in presence of air Low temperature carbonisation ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³. 4000 2500 10000 6500 4000 2500 10000 6500 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion With increase in calorific value of fuels, their adiabatic flame temperatures Remain unchanged Increase May increase or decrease ; depends on the quantity of products of combustion Decrease Remain unchanged Increase May increase or decrease ; depends on the quantity of products of combustion Decrease ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen. Not related to Same as Lower than Higher than Not related to Same as Lower than Higher than ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Stack heat losses can be minimised by Oxygen enrichment of combustion air Using low c.v. fuels Controlling the excess air Maintaining proper draft in the furnace Oxygen enrichment of combustion air Using low c.v. fuels Controlling the excess air Maintaining proper draft in the furnace ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Rate of low temperature oxidation of coal due to bad storage conditions Is more for low volatile coal compared to high volatile coal Is accelerated by storage in large heaps with small surface to volume ratio Does not vary with increase in surface area Decreases with increase in surface area Is more for low volatile coal compared to high volatile coal Is accelerated by storage in large heaps with small surface to volume ratio Does not vary with increase in surface area Decreases with increase in surface area ANSWER DOWNLOAD EXAMIANS APP
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