B. 261.0565 A B. 340.9198 V f. A 4-pole, 50-Hz, 440-V, 85-kW, 3-phase star-connected synchronous motor has resistance and synchronous reactance per phase of 0.05 ohm and 0.5 ohms respectively. Assuming the efficiency of the synchronous motor is 92.5 percent and a full load power factor of 0.8 leading, compute for the back emf per phase and mechanical power developed. 42. Armature Current A. 371.7786 A 43. Back emf per phase A. 762.1024 V 44. Total copper loss C. 241.4773 A D. 227.8804 A C. 328.2493 V D. 254.0341 V A. 10.2226 kW B. 34.2452 kW C. 5.9060 kW D. 59.3144 kW 45. Mechanical Power developed A. 72.4245 kW B. 79.0940 kW C. 81.6696 kW D. 94.7774 kW _46. Torque A. 461.1025 N.m B. 518.8476 N.m C. 519.9613 N.m D. 584.2521 N.m g. A 3-phase, delta-connected synchronous motor has an excitation of 425 volts. The resistance and synchronous reactance per phase is 0.4 ohms and 5.0 ohms respectively. The induced emf is 530 volts. Calculate the: 47. Power output A. 118.2222 kW B. 120.1222 kW C. 122.2111 KW D. 134.6978 kW 48. Line current A. 252.3716 A B. 232.4621 A C. 225.2716 A D. 130.0606 A 49. Power factor A. 0.8957 lead B. 0.8957 lag C. 0.8468 lead D. 0.8468 lag 50. Efficiency for maximum power output if the friction and iron losses are constant at 1200 watts A. 76.4523 % B. 78.4530% C. 84.5454 % D. 85.5444%

B. 261.0565 A B. 340.9198 V f. A 4-pole, 50-Hz, 440-V, 85-kW, 3-phase star-connected synchronous motor has resistance and synchronous reactance per phase of 0.05 ohm and 0.5 ohms respectively. Assuming the efficiency of the synchronous motor is 92.5 percent and a full load power factor of 0.8 leading, compute for the back emf per phase and mechanical power developed. 42. Armature Current A. 371.7786 A 43. Back emf per phase A. 762.1024 V 44. Total copper loss C. 241.4773 A D. 227.8804 A C. 328.2493 V D. 254.0341 V A. 10.2226 kW B. 34.2452 kW C. 5.9060 kW D. 59.3144 kW 45. Mechanical Power developed A. 72.4245 kW B. 79.0940 kW C. 81.6696 kW D. 94.7774 kW _46. Torque A. 461.1025 N.m B. 518.8476 N.m C. 519.9613 N.m D. 584.2521 N.m g. A 3-phase, delta-connected synchronous motor has an excitation of 425 volts. The resistance and synchronous reactance per phase is 0.4 ohms and 5.0 ohms respectively. The induced emf is 530 volts. Calculate the: 47. Power output A. 118.2222 kW B. 120.1222 kW C. 122.2111 KW D. 134.6978 kW 48. Line current A. 252.3716 A B. 232.4621 A C. 225.2716 A D. 130.0606 A 49. Power factor A. 0.8957 lead B. 0.8957 lag C. 0.8468 lead D. 0.8468 lag 50. Efficiency for maximum power output if the friction and iron losses are constant at 1200 watts A. 76.4523 % B. 78.4530% C. 84.5454 % D. 85.5444%