Steam Boilers, Engines, Nozzles and Turbines Primary air is the air used to Transport and dry the coal Air delivered by forced draft fan Convert CO (formed in lower zone of furnace) into CO₂ at higher zone Provide air around burners for obtaining optimum combustion Transport and dry the coal Air delivered by forced draft fan Convert CO (formed in lower zone of furnace) into CO₂ at higher zone Provide air around burners for obtaining optimum combustion ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades. 15 to 20% 20 to 30% 10 to 15% 30 to 40% 15 to 20% 20 to 30% 10 to 15% 30 to 40% ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Which is not correct statement about pulverized fuel firing? Fuel burns economically High burning rate is possible Heat release can be easily controlled It is the best technique for burning high ash content fuel having low fusion ash Fuel burns economically High burning rate is possible Heat release can be easily controlled It is the best technique for burning high ash content fuel having low fusion ash ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Size of boiler tubes is specified by Inside diameter and thickness Mean diameter and thickness Outside diameter and thickness Outside diameter and inside diameter Inside diameter and thickness Mean diameter and thickness Outside diameter and thickness Outside diameter and inside diameter ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The power of a boiler may be defined as The amount of water evaporated or steam produced in kg per kg of fuel burnt The amount of water evaporated from and at 100° C into dry and saturated steam The evaporation of 15.653 kg of water per hour from and at 100° C The ratio of heat actually used in producing the steam to the heat liberated in the furnace The amount of water evaporated or steam produced in kg per kg of fuel burnt The amount of water evaporated from and at 100° C into dry and saturated steam The evaporation of 15.653 kg of water per hour from and at 100° C The ratio of heat actually used in producing the steam to the heat liberated in the furnace ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Efficiency of Rankine cycle can be increased by Decreasing initial steam pressure and temperature Increasing the expansion ratio Increasing exhaust pressure Decreasing exhausts pressure Decreasing initial steam pressure and temperature Increasing the expansion ratio Increasing exhaust pressure Decreasing exhausts pressure ANSWER DOWNLOAD EXAMIANS APP
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