Engine: Electricity

1. A It inverts exciter armature DC to AC for rotating main field excitation, but does not eliminate the need for brushes. .
2. B It rectifies exciter armature AC to DC for rotating main field excitation, but does not eliminate the need for brushes..
3. C It rectifies exciter armature AC to DC for rotating main field excitation and eliminates the need for brushes.
4. D It inverts exciter armature DC to AC for rotating main field excitation and eliminates the need for brushes.

Tip: press A-D to answer