226. On a modern silicon controlled rectified diesel-electric drive system, what are the characteristics of the main propulsion generators?

The generators are of the alternating current type running at constant frequency and delivering a constant voltage.
The generators are of the direct current type running at constant speed and delivering a constant voltage.
The generators are of the alternating current type running at variable frequency and delivering a variable voltage.
The generators are of the direct current type running at variable speed and delivering a variable voltage.

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