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 The pressure at which latent heat of vaporisation of water is zero, is 100 kg/cm² Below atmospheric pressure 1 kg/cm² 225.6 kg/cm² 100 kg/cm² Below atmospheric pressure 1 kg/cm² 225.6 kg/cm² ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value (1 + moisture content) 1 + moisture content 1 – moisture content (1- moisture content) (1 + moisture content) 1 + moisture content 1 – moisture content (1- moisture content) ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Thermal equilibrium means that the flow of steam is Polytropic Hyperbolic Isentropic Isothermal Polytropic Hyperbolic Isentropic Isothermal ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The diameter of Cornish boiler is of the order of 23 m 12 m 1.52.5 m 2.53.5 m 23 m 12 m 1.52.5 m 2.53.5 m ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Besides mean effective pressure, the data required to determine the indicated power of an engine include Piston diameter, specific fuel consumption and Calorific value of fuel Piston diameter, length of stroke and calorific value of fuel Specific fuel consumption, speed of rotation and torque Piston diameter, length of stroke and speed of rotation Piston diameter, specific fuel consumption and Calorific value of fuel Piston diameter, length of stroke and calorific value of fuel Specific fuel consumption, speed of rotation and torque Piston diameter, length of stroke and speed of rotation ANSWER DOWNLOAD EXAMIANS APP
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