Question

Filters are used alongwith a full-wave rectifier to

• A. remove AC part from the output
• B. remove DC part from the output
• C. mix AC and DC
• D. None of the above

Answer 1

Answer: (A)

To get steady $DC$ output from the pulsating voltage normally, a capacitor is connected across the output terminals (parallel to the load $R_L$ ).
One can also use an inductor in series with $R_L$ for the same purpose.
Since, these additional circuits appear to filter out the $AC$ ripple and give a pure $DC$ voltage, so they are called filters.