unit 3

2. In DC Machines, high starting current produces at the brushes.
4. These windings are used to start synchronous motor.
5. Heavy dips of the voltage occurs during ..................
6. This motor is started with reduced voltage method.
10. In DC machines, the starting current must be limited for good ..................
11. This time must be reduced to improve the productivity.
14. Motor has this tendency to .................. in the reverse direction.
15. Starting torque must produce .................. acceleration.
16. High starting current .................. the motor.

1. Braking employed where K.E. of rotating parts is dissipated in an external Resistance.
3. Braking occurs whenever the motor has a tendency to run faster than rotating field.
5. This Motor is not self starting.
7. Most effective braking.
8. In converter operation additional .................. of current affect the commutation.
9. Counter current braking is accomplished by reconnecting the suppy to .................. of the motor.
12. Processes involved with starting of the drive.
13. Low frequency starting can be employed if the motor is fed from a ..................