Steam Boilers, Engines, Nozzles and Turbines During polytropic process Heat transfer takes place across cylinder walls All of these Steam may be wet, dry or superheated after expansion Work is done Heat transfer takes place across cylinder walls All of these Steam may be wet, dry or superheated after expansion Work is done ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The proximate analysis of fuel lists Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight ANSWER DOWNLOAD EXAMIANS APP
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 = V² cosα Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V cosα Vb = V² cosα Vb = 0.5 V cosα Vb = 0.5 V² cosα ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The change in internal energy in steam engines equals to Work done during compression Change in enthalpy Work done during adiabatic expansion Work done during the Rankine cycle Work done during compression Change in enthalpy Work done during adiabatic expansion Work done during the Rankine cycle ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet) Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V cos α Vb = V² cos α Vb = 0.5 V cosα Vb = 0.5 V² cosα Vb = V cos α Vb = V² cos α ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Caking coals are those which Burn completely Show little or no fusing action Burn freely Form lumps or masses of coke Burn completely Show little or no fusing action Burn freely Form lumps or masses of coke ANSWER DOWNLOAD EXAMIANS APP
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