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 V cosα Vb = V cosα Vb = 0.5 V² cosα Vb = V² cosα Vb = 0.5 V cosα Vb = V cosα Vb = 0.5 V² cosα Vb = V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In an impulse turbine, steam expands Wholly in nozzle Wholly in blades Partly in the nozzle and partly in blades None of these Wholly in nozzle Wholly in blades Partly in the nozzle and partly in blades None of these 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 More Equal May be less or more depending on temperature Less More Equal May be less or more depending on temperature ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The power of a boiler may be defined as 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 The ratio of heat actually used in producing the steam to the heat liberated in the furnace ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines An economiser _________ the steam raising capacity of a boiler. Increases Decreases None of these Has no effect on Increases Decreases None of these Has no effect on ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The compounding of turbines is done in order to Reduce exit losses Improve efficiency All of these Reduce speed of rotor Reduce exit losses Improve efficiency All of these Reduce speed of rotor ANSWER DOWNLOAD EXAMIANS APP
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