Steam Boilers, Engines, Nozzles and Turbines The crown of the fire box is made hemispherical in order to Resist intense heat in fire box Give maximum strength Withstand pressure inside boiler Give maximum space Resist intense heat in fire box Give maximum strength Withstand pressure inside boiler Give maximum space ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be None of these Choked Under-damping Over-damping None of these Choked Under-damping Over-damping ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Steam in water tube boiler as compared to fire tube boiler Is raised at slower rate Can be raised rapidly Could be raised at fast/slow rate depending on design Is raised at same rate Is raised at slower rate Can be raised rapidly Could be raised at fast/slow rate depending on design Is raised at same rate ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The ratio of the workdone on the blades to the energy supplied to the blades, is called Gross or stage efficiency Nozzle efficiency Mechanical efficiency Blading efficiency Gross or stage efficiency Nozzle efficiency Mechanical efficiency Blading efficiency 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 = 0.5 V cosα Vb = V² cos α Vb = 0.5 V² cosα Vb = V cos α Vb = 0.5 V cosα Vb = V² cos α Vb = 0.5 V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades. Less None of these More Equal Less None of these More Equal ANSWER DOWNLOAD EXAMIANS APP
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