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 = 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 Vb = V cos α ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The economiser is used in boilers to Increase flue gas temperature Economize on fuel Increase thermal efficiency of boiler Extract heat from the exhaust flue gases Increase flue gas temperature Economize on fuel Increase thermal efficiency of boiler Extract heat from the exhaust flue gases ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The diameter of Cornish boiler is of the order of 23 m 2.53.5 m 1.52.5 m 12 m 23 m 2.53.5 m 1.52.5 m 12 m ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as Fusible plug Superheater Blow off cock Stop valve Fusible plug Superheater Blow off cock Stop valve ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Sulphur in coal results in Spontaneous combustion during coal storage Corroding air heaters Facilitating ash precipitation All of these Spontaneous combustion during coal storage Corroding air heaters Facilitating ash precipitation All of these ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Caking coals are those which Form lumps or masses of coke Burn completely Show little or no fusing action Burn freely Form lumps or masses of coke Burn completely Show little or no fusing action Burn freely ANSWER DOWNLOAD EXAMIANS APP
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