Q. In a rectifier, we have capacitor filters. What is the actual purpose of a filter?

A
To block certain frequencies
B
To pass certain frequencies
C
To convert ac to dc
D
To retain the output
Solution:

Whenever we place a capacitor filter, within a circuit, it filters the output. In other words, a filter is a device that blocks certain frequencies.
We have several filters. Based on that, it will block that particular frequency range.
The answer is option (a).

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