Engine 2014: Electricity

1. A To convert the AC output of the exciter armature to DC for main rotor field excitation
2. B To convert the DC output of the main rotor field to AC for exciter armature excitation
3. C To convert the DC output of the exciter armature to AC for main rotor field excitation
4. D To convert the AC output of the main rotor field to DC for exciter armature excitation

Tip: press A-D to answer