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 = 0.5 V cosα Vb = V cosα Vb = V² cosα Vb = 0.5 V² cosα Vb = 0.5 V cosα Vb = V cosα Vb = V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly 2.86 10.05 6.65 1.05 2.86 10.05 6.65 1.05 ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The equivalent evaporation is defined as 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 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 ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Tertiary air is the air used to Transport and dry the coal Cool the scanners Provide air around burners for obtaining optimum combustion Convert CO (formed in lower zone of furnace) into CO₂ at higher zone Transport and dry the coal Cool the scanners Provide air around burners for obtaining optimum combustion Convert CO (formed in lower zone of furnace) into CO₂ at higher zone 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 None of the listed here ηS = ηB / ηN ηS = ηB × ηN ηS = ηN / ηB None of the listed here ηS = ηB / ηN ηS = ηB × ηN ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In an impulse reaction turbine, the pressure drops gradually and continuously over Both fixed and moving blades Fixed blades Moving blades None of these Both fixed and moving blades Fixed blades Moving blades None of these ANSWER DOWNLOAD EXAMIANS APP
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