31. the Carnet dels at the same maximum and minimum temperatures a Rankine eye, the how would you compare the efficiency

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31 The Carnet Dels At The Same Maximum And Minimum Temperatures A Rankine Eye The How Would You Compare The Efficiency 1 (52.07 KiB) Viewed 26 times

31. the Carnet dels at the same maximum and minimum temperatures a Rankine eye, the how would you compare the efficiency of a Rankine gyde to that of a Carnot code? Emcency is the same Higher efficiency Emciency is higher by 30% d Lower efficiency 32. For steam power plants, increasing the operating pressure of the boller will: Increase thermal eiciency Decrease thermal efficiency Bring thermal efficiency to nero Malce thermal efficiency constant d 85 C der 2 с. 33. From the previous problem, determine the thermal efficiency if the pump and turbine have an tsentropic ethiciency of 37.12% 24.48% b 31.4596 d. 28.74% 34. What process is employed when the turbine in steam power plants experience excessive moisture? reheating supercooling subcooling d freezing 35. When the number of reheat stages in a reheat cycle is increased, the average temperature increases constant decreases 36. From the previous problem, determine the thermal efficiency if each turbine stage have the same isentropic efficiency of 85% 37.12% 34.24% b 31.45% d. 40.3296 37. The entrance and exit enthalpies of steam turbine are 4000 kJ/kg and 3000 kJ/kg respectively. What is the mass of steam entering the turbine if the generator power is 3 MW and generator efficiency is 90%7 12,000 kg/hr 17,000 kg/hr b. 14,000 kg/hr d. 24,000 kg/hr 38. Steam enters the turbine at the rate of 11,000 kg/hr with enthalples of 3000 kJ/kg and 1000 kJ/kg at the entrance and schaust respectively. Steam is extracted from the turbine at 3500 kg/hr for heating purposes with enthalpy of 2700 ki/kg Calculate the turbine work 5468.33 kW 4458.33 kW b. 4569.33 kW d. 5425 33 kW 39. Asteam engine has an indicated efficiency of 65%. The enthalples of the engine at the entrance and exit are 3000K/ and 2500 KJ/kg respectively. If the mechanical efficiency is 85% and the consumption is 1000 kg/hr, what is the brake power of the engine? 76.64 kW 78.54 kW 82.34 kW C 87.67 kW 40. Asteam engine consumes 13,300 km/hr steam when developing an indicated power of 15 MW and 18,700 kg/hr when the indicated power is 225 MW. What is the steam consumption in kat/bar and the specific consumption in kg/kW.hr when developing 2 MW 16,900 kg/hr; 1.45 kg/kW.hr 17 800 kg/hr: 9.13 kg/kW.hr 20.100 kg/hr: 10.63 kW.hr d 14.675 kg/hr: 6.78 kg/kW.hr