The function of an inductor in a filter circuit is to ______.

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Question

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 2

Answer 1

Inductors are used to block AC while allowing DC to pass through it, inductors designed for this purpose are known as chokes.

F1 J.P Madhu 16.03.20 D1

The Inductor ‘L’ is connected in series between the rectifier circuit and the load. The inductor carries the property of opposing the change in current that flows through it.

F1 J.P Madhu 16.03.20 D2

In other words, the inductor offers high impedance to the ripples and no impedance to the desired dc components. Thus the ripple components will be eliminated.

F1 J.P Madhu 16.03.20 D3

When the rectifier output current increases above a certain value, energy is stored in it in the form of a magnetic field and this energy is given up when the output current falls below the average value.
Thus all the sudden changes in current that occurs in the circuit will be smoothened by placing the inductor in series between the rectifier and the load.
Inductors are generally used in electronic filters to separate signals of different frequencies, and in combination with capacitors to make tuned circuits, used to tune radio and TV receivers.