Fuels and Combustion Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? Excessive fly-ash discharge from the stack Ash disposal problem Erosion of induced draft fan blades High power consumption in its transportation Excessive fly-ash discharge from the stack Ash disposal problem Erosion of induced draft fan blades High power consumption in its transportation ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion A coal with high ash content Is harder and stronger Has higher calorific value Is not subjected to washing Has low quantity of mineral matter Is harder and stronger Has higher calorific value Is not subjected to washing Has low quantity of mineral matter ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The main function of primary air in pulverised coal fired burner is to Burn CO to CO₂ Preheat the tertiary air used for complete combustion of CO to CO₂ Dry and transport the coal Have proper combustion by supplying it around the burner Burn CO to CO₂ Preheat the tertiary air used for complete combustion of CO to CO₂ Dry and transport the coal Have proper combustion by supplying it around the burner ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in Fine sizes without the presence of any lump Shallow and small piles Large heaps with small surface to volume ratio Closed space without any ventilation facility Fine sizes without the presence of any lump Shallow and small piles Large heaps with small surface to volume ratio Closed space without any ventilation facility ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Incomplete combustion of a fuel is characterised by the high __________ in the flue gas. Oxygen Temperature Carbon monoxide Smoke Oxygen Temperature Carbon monoxide Smoke ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Presence of free moisture in coal is most disadvantageous during Combustion of fire slacks on the grates None of these Its pulverisation (as it requires more power) Handling (e.g. when emptying wagons) Combustion of fire slacks on the grates None of these Its pulverisation (as it requires more power) Handling (e.g. when emptying wagons) ANSWER DOWNLOAD EXAMIANS APP
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