184. As shown in figure «A» of the illustrated propulsion motor variable speed drive, what statement is true

both the bridge rectifier and the controller inverter bridge are transistor controlled in terms of switching
the bridge rectifier is uncontrolled and the controller inverter bridge is thyristor controlled in terms of switching
the bridge rectifier is uncontrolled and the controller inverter bridge is transistor controlled in terms of switching
both the bridge rectifier and the controller inverter bridge are thyristor controlled in terms of switching

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