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Pulsating output of a rectifier is converted into a steady DC level by 

Pulsating output of a rectifier is converted into a steady DC level by  Correct Answer Filter Circuit

The various stages of Power supply are shown:

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Transformer:

Transformer is used to step down the input voltage.

Rectifier:

Rectifier is used to convert Bipolar AC voltage into unipolar Pulsating DC.

Filter:

The filter circuit converts the pulsating DC into steady state DC but it has ripples.

Regulator:

Regulator is used to remove the ripples from the DC voltage.

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