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56. In a series regulator, what is the purpose of fold-back limiting?
(a) to provide more current in the case of a short circuit
(b) to limit output voltage if input voltage goes too high
(c) to bypass the pass-transistor, if the pass-transistor should fail
(d) to provide current up to a maximum, but drop current to a lower value when the output becomes shorted, to prevent overheating of the device
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