Steam Boilers, Engines, Nozzles and Turbines Primary air is the air used to Provide air around burners for obtaining optimum combustion Convert CO (formed in lower zone of furnace) into CO₂ at higher zone Air delivered by forced draft fan Transport and dry the coal Provide air around burners for obtaining optimum combustion Convert CO (formed in lower zone of furnace) into CO₂ at higher zone Air delivered by forced draft fan Transport and dry the coal ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet) Vb = V cos α Vb = V² cos α Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V cos α Vb = V² cos α Vb = 0.5 V cosα Vb = 0.5 V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Pick up the wrong statement about water tube boiler in comparison to fire tube boilers Former is used for high installed capacity Former occupies less space for same power Rate of steam flow is more in former case Chances of explosion are less in former case Former is used for high installed capacity Former occupies less space for same power Rate of steam flow is more in former case Chances of explosion are less in former case ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The temperature of flue gases at air heater outlet should be Less than wet bulb temperature of flue gases Above dew point temperature of flue gases Below dew point temperature of flue gases 100°C Less than wet bulb temperature of flue gases Above dew point temperature of flue gases Below dew point temperature of flue gases 100°C ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines It is required to produce large amount of steam at low pressure. Which boiler should be used? Pulverized fuel fired boiler Lancashire boiler Cochran boiler Babcock and Wilcox boiler Pulverized fuel fired boiler Lancashire boiler Cochran boiler Babcock and Wilcox boiler ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C. 60°C 100°C 40°C 0°C 60°C 100°C 40°C 0°C ANSWER DOWNLOAD EXAMIANS APP
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