Steam Boilers, Engines, Nozzles and Turbines Tertiary air is the air used to Cool the scanners Provide air around burners for obtaining optimum combustion Transport and dry the coal Convert CO (formed in lower zone of furnace) into CO₂ at higher zone Cool the scanners Provide air around burners for obtaining optimum combustion Transport and dry the coal Convert CO (formed in lower zone of furnace) into CO₂ at higher zone ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Steam in water tube boiler as compared to fire tube boiler Is raised at same rate Could be raised at fast/slow rate depending on design Is raised at slower rate Can be raised rapidly Is raised at same rate Could be raised at fast/slow rate depending on design Is raised at slower rate Can be raised rapidly ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency) ηS = ηN / ηB ηS = ηB × ηN None of the listed here ηS = ηB / ηN ηS = ηN / ηB ηS = ηB × ηN None of the listed here ηS = ηB / ηN ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The relative efficiency is defined as the Ratio of thermal efficiency to Rankine efficiency Ratio of brake power to the indicated power Product of thermal efficiency and Rankine efficiency Ratio of heat equivalent to indicated power to the energy supplied in steam Ratio of thermal efficiency to Rankine efficiency Ratio of brake power to the indicated power Product of thermal efficiency and Rankine efficiency Ratio of heat equivalent to indicated power to the energy supplied in steam 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 Isothermal process Free expansion process Isentropic process Throttling process Isothermal process Free expansion process Isentropic process ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly 280 kg/h 150 kg/h 340 kg/h 210 kg/h 280 kg/h 150 kg/h 340 kg/h 210 kg/h ANSWER DOWNLOAD EXAMIANS APP
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