Engine 2014: Electricity

1. A to invert constant frequency AC output from the shaft generator to DC and then rectify the DC to a variable frequency AC output for delivery to the bus
2. B to invert variable frequency AC output from the shaft generator to DC and then invert the DC to a constant frequency AC output for delivery to the bus
3. C to rectify constant frequency AC output from the shaft generator to DC and then invert the DC to a variable frequency AC output for delivery to the bus
4. D to rectify variable frequency AC output from the shaft generator to DC and then invert the DC to a constant frequency AC output for delivery to the bus

Tip: press A-D to answer