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 = V cosα Vb = V² cosα Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V cosα Vb = V² cosα Vb = 0.5 V cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines An economiser is generally placed between Induced draft fan and forced draft fan Last superheater or reheater and air preheater None of these Air preheater and chimney Induced draft fan and forced draft fan Last superheater or reheater and air preheater None of these Air preheater and chimney 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 More Equal May be less or more depending on temperature Less More Equal May be less or more depending on temperature Less ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The ratio of the volume at cut-off to the swept volume is called Expansion ratio None of these Cut-off ratio Clearance ratio Expansion ratio None of these Cut-off ratio Clearance ratio ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines An economiser in a boiler Increases steam flow Increases steam pressure Decreases steam pressure Decreases fuel consumption Increases steam flow Increases steam pressure Decreases steam pressure Decreases fuel consumption ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as 100°C and 1.1 bar pressure 50°C and 1.1 bar pressure 100°C and normal atmospheric pressure 50°C and normal atmospheric pressure 100°C and 1.1 bar pressure 50°C and 1.1 bar pressure 100°C and normal atmospheric pressure 50°C and normal atmospheric pressure ANSWER DOWNLOAD EXAMIANS APP
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