Discussion
The dc link of a converter-fed dc drive contains a capacitor in order to
Answer: D
Correct answer: hold the link voltage steady against pulsating current
The rectifier delivers a pulsating current and the inverter or chopper draws current in bursts, so without a capacitor the link voltage would swing with them. The capacitor acts as a low-impedance reservoir, absorbing those pulsations and presenting a stiff voltage source to the stage that follows. Note that this same stiffness is why a diode-fed link cannot accept regenerated energy: the voltage simply rises until protection operates.
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