Engine 2014: Electricity

1. A shift from the automatic voltage regulator to manual voltage control or vice versa
2. B shift the governor control from manual to automatic/zero droop or vice versa
3. C enable the operator to read the field voltage on device 'Volt.Reg.Adj.Pot.' or device 'Man.Volt.Adj.Rheo'
4. D supply regulated control power to the switchboard

Tip: press A-D to answer