engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 Electrical Machines Alternator and Synchronous Motors
If excitation of a synchronous motor running with a constant load is decreased from its normal excitation value, it leads to
1
Increase in both armature current and power factor angle
2
Increase in both armature current and power factor which is lagging
3
Increase in back e.m.f. but decrease in armature current
4
Increase in torque angle but decrease in back e.m.f.