Engine 2014: Electricity

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

Tip: press A-D to answer