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A voltage regulator needs to provide a constant voltage in spite of the fact that there may be

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A voltage regulator needs to provide a constant voltage in spite of the fact that there may be

(a) Change in the load current drawn from the  terminals of the regulator

(b) Change of the DC power supply that feeds the regulator circuit

(c) None of the mentioned

(d) All of the mentioned

This question was addressed to me during an internship interview.

This intriguing question comes from Modelling the Diode Forward Characteristics in chapter Diodes of Electronic Devices & Circuits

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Right choice is (d) All of the mentioned

Easy explanation: Voltage regulators are required in both of the situations mentioned.

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