engineering recuitment DVC Junior Engineer Mock Test 2024 Electrical Machines Alternator and Synchronous Motors Effect of Excitation on Armature Current and Power Factor
When V-curve of synchronous motor is obtained experimentally, it is frequently observed that the lowest point on V-curve does not indicate unity power factor. This is
1
due to variations in supply frequency
2
due to inaccurate readings in meters
3
due to hormonic arise from deviation of counter emf from simple sine wave
4
due to increase in field current