Electrical question pls help?

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answers:
Steven say: 2x frequency means it has to be full wave. The poor efficiency implies it is a low voltage with two diode drop losses, or otherwise high forward voltage drop, so that would be #1. Your teacher is using terms that are not widely accepted and well defined so it is difficult to be precise. #1 only is not offered by the multiple choice so the answer is (C) or possibly (B).
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derfram say: I'd go with (C) also. Can't really tell much from the efficiency number as we don't know if this is a 3.3 volt supply(where the diode drop would be significant) or a 500 volts supply (where the diode drop would be insignificant).
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nokpi say: ctavutdz
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dmftc say: yiuiumcg
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