Steam Boilers, Engines, Nozzles and Turbines A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as Superheater Injector Air-preheater Economizer Superheater Injector Air-preheater Economizer ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The reheat factor depends upon Exit pressure Turbine stage efficiency All of these Initial pressure and superheat Exit pressure Turbine stage efficiency All of these Initial pressure and superheat ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle) Vb = V² cosα Vb = 0.5 V cosα Vb = V cosα Vb = 0.5 V² cosα Vb = V² cosα Vb = 0.5 V cosα Vb = V cosα Vb = 0.5 V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The mechanical draught _________ with the amount of smoke. Increases Decreases None of these Does not effect Increases Decreases None of these Does not effect ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Sublimation region is the region where Solid and vapor phases are in equilibrium Liquid and vapor phases are in equilibrium Solid, liquid and vapor phases are in equilibrium Solid and liquid phases are in equilibrium Solid and vapor phases are in equilibrium Liquid and vapor phases are in equilibrium Solid, liquid and vapor phases are in equilibrium Solid and liquid phases are in equilibrium ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to ps - pa pa + ps None of these pa - ps ps - pa pa + ps None of these pa - ps ANSWER DOWNLOAD EXAMIANS APP
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