Steam Boilers, Engines, Nozzles and Turbines The principal function of a stop valve is to Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required Increase the temperature of saturated steam without raising its pressure Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required Increase the temperature of saturated steam without raising its pressure Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler 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 V² cosα Vb = 0.5 V cosα Vb = V cos α Vb = V² cos α Vb = 0.5 V² cosα Vb = 0.5 V cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In locomotive boiler, maximum steam pressure is limited to 10 kg/cm² 5 kg/cm² 1 kg/cm² 18 kg/cm² 10 kg/cm² 5 kg/cm² 1 kg/cm² 18 kg/cm² ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The overall efficiency of thermal power plant is Boiler efficiency, turbine efficiency, generator efficiency All the three above plus gas cycle efficiency Regenerative cycle efficiency Carnot cycle efficiency Boiler efficiency, turbine efficiency, generator efficiency All the three above plus gas cycle efficiency Regenerative cycle efficiency Carnot cycle efficiency ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The selection of type and size of a steam boiler depends upon The fuel and water available The geographical position of the power house The power required and working pressure All of these The fuel and water available The geographical position of the power house The power required and working pressure All of these ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is Equal Less May be less or more depending on temperature More Equal Less May be less or more depending on temperature More ANSWER DOWNLOAD EXAMIANS APP
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