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 = V cosα Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V² cosα Vb = V cosα Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called Wet steam Superheated steam Cushion steam Saturated steam Wet steam Superheated steam Cushion steam Saturated steam ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Adiabatic process is Non-heat transfer process Reversible process Constant temperature process Essentially an isentropic process Non-heat transfer process Reversible process Constant temperature process Essentially an isentropic process ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then α₁ = β₁ and α₂= β₂ α₁ = β₂ and β₁ = α₂ α₁ = α₂ and β₁ = β₂ α₁ < β₁ and α₂ > β₂ α₁ = β₁ and α₂= β₂ α₁ = β₂ and β₁ = α₂ α₁ = α₂ and β₁ = β₂ α₁ < β₁ and α₂ > β₂ ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Which is not correct statement about effect of sulphur in fuel? It has heating value It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low It helps in electrostatic precipitation of ash in flue gases It erodes furnace walls It has heating value It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low It helps in electrostatic precipitation of ash in flue gases It erodes furnace walls ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The indicated thermal efficiency is defined as the 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 the 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 the Rankine efficiency ANSWER DOWNLOAD EXAMIANS APP
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