Discussion
In a diode rectifier, the capacitors with large values of C are used in filter circuits in order to
Answer: C
Large capacitors are used to increase the time constant to high value.
In a rectifier filter, the capacitor charges to the peak voltage and then discharges through the load between peaks. A large C makes the time constant RC much longer than the gap between peaks, so the capacitor discharges only slightly and the output stays close to the peak: the ripple is reduced.
So large C does not increase the ripple or make the capacitor discharge quickly, and it does not reduce or double the peak voltage.
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