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 = 0.5 V² cosα Vb = V cosα Vb = 0.5 V cosα Vb = V² cosα Vb = 0.5 V² cosα Vb = V cosα Vb = 0.5 V cosα Vb = V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will Improve Worsen May improve/worsen depending on size Remain unaffected Improve Worsen May improve/worsen depending on size Remain unaffected 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. 10 to 15% 20 to 30% 15 to 20% 30 to 40% 10 to 15% 20 to 30% 15 to 20% 30 to 40% ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Efficiency of Rankine cycle can be increased by Decreasing initial steam pressure and temperature Decreasing exhausts pressure Increasing exhaust pressure Increasing the expansion ratio Decreasing initial steam pressure and temperature Decreasing exhausts pressure Increasing exhaust pressure Increasing the expansion ratio ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The difference between Cornish boiler and Lancashire boiler is that Former is fire tube type and latter is water tube type boiler Former is water tube type and latter is fire tube type Former contains one fire tube and latter contains two fire tubes None of the listed here Former is fire tube type and latter is water tube type boiler Former is water tube type and latter is fire tube type Former contains one fire tube and latter contains two fire tubes None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is High Low Very low Very high High Low Very low Very high ANSWER DOWNLOAD EXAMIANS APP
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