Steam Boilers, Engines, Nozzles and Turbines The power of a boiler may be defined as The evaporation of 15.653 kg of water per hour from and at 100° C The amount of water evaporated or steam produced in kg per kg of fuel burnt The ratio of heat actually used in producing the steam to the heat liberated in the furnace The amount of water evaporated from and at 100° C into dry and saturated steam The evaporation of 15.653 kg of water per hour from and at 100° C The amount of water evaporated or steam produced in kg per kg of fuel burnt The ratio of heat actually used in producing the steam to the heat liberated in the furnace The amount of water evaporated from and at 100° C into dry and saturated steam ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Pulverized fuel is used for More calorific value Less radiation loss Medium sized units Better burning More calorific value Less radiation loss Medium sized units Better burning ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Incomplete combustion can be best judged by Excess air in flue gases Smoky chimney exit Measuring carbon monoxide in flue gases Measuring temperature of flue gases at exit of furnace Excess air in flue gases Smoky chimney exit Measuring carbon monoxide in flue gases Measuring temperature of flue gases at exit of furnace ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle) V = 44.72 K hd V = 44.72 K hd V = 44.72 hd K V = 44.72 K hd V = 44.72 K hd V = 44.72 K hd V = 44.72 hd K V = 44.72 K hd ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle) tan²α cot²α sin²α cos²α tan²α cot²α sin²α cos²α ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The function of a piston in a steam engine is To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment To transfer motion from the piston to the cross-head To guide motion of the piston rod and to prevent it from bending None of these To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment To transfer motion from the piston to the cross-head To guide motion of the piston rod and to prevent it from bending None of these ANSWER DOWNLOAD EXAMIANS APP
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