Engine 2014: Electricity

1. A propulsion generators which produce DC power that is converted to AC power for the propulsion motor
2. B propulsion generators which produce DC power that is directly delivered to the series wound DC propulsion motor
3. C propulsion generators which produce AC power that is directly delivered to the synchronous AC propulsion motor
4. D propulsion generators which produce AC power that is converted to DC power for the shunt wound DC propulsion motor

Tip: press A-D to answer