Steam Boilers, Engines, Nozzles and Turbines During polytropic process Steam may be wet, dry or superheated after expansion All of these Heat transfer takes place across cylinder walls Work is done Steam may be wet, dry or superheated after expansion All of these Heat transfer takes place across cylinder walls Work is done ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour) I.P. = b × m + a m = a + b × I.P. I.P. = a × m + b m = (b/I.P.) - a I.P. = b × m + a m = a + b × I.P. I.P. = a × m + b m = (b/I.P.) - a ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Water tube boilers are those in which Work is done during adiabatic expansion Change in enthalpy Flue gases pass through tubes and water around it Water passes through the tubes and flue gases around it Work is done during adiabatic expansion Change in enthalpy Flue gases pass through tubes and water around it Water passes through the tubes and flue gases around it 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 Less Equal More May be less or more depending on temperature Less Equal More May be less or more depending on temperature ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The expansion of steam, as it flows over the blades in reaction turbine, represents Throttling process Free expansion process Isentropic process Isothermal process Throttling process Free expansion process Isentropic process Isothermal process ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase Decreases Remains unchanged Increases/decreases depending on steam temperature requirements Increases Decreases Remains unchanged Increases/decreases depending on steam temperature requirements Increases ANSWER DOWNLOAD EXAMIANS APP
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