Ham Radio General Class Practice Test

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What is a common name for an inductor used to help smooth the DC output from the rectifier in a conventional power supply?

Back EMF choke
Repulsion coil
Charging inductor
Filter choke

The correct answer is: Filter choke

The term "filter choke" refers to an inductor that plays a crucial role in smoothing out the direct current (DC) output that comes from a rectifier in a power supply. When alternating current (AC) is rectified, it can produce a pulsating DC signal. The filter choke, placed in series with the load, helps to reduce these ripples by opposing changes in current due to its inductive properties. This results in a steadier and smoother output voltage, making it more suitable for powering electronic devices. In contrast to the filter choke, options like "back EMF choke," "repulsion coil," and "charging inductor" do not accurately describe inductors used for this specific purpose. Back EMF chokes are typically associated with inductive loads in circuits where back electromotive force is a consideration. A repulsion coil is generally related to a mechanism in certain types of electric motors rather than power supply smoothing. Charging inductors may imply inductors used in specific circuits for energy storage or transfer but are not commonly referred to as filter components in power supplies.