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What are filters created by using resistors and capacitors or inductors and capacitors called?

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What are filters created by using resistors and capacitors or inductors and capacitors called?

(a) Active filters

(b) Passive filters

(c) Continuous filters

(d) Differential filters

The question was posed to me during an interview.

Enquiry is from Filters in division Fundamentals of Electronics of Avionics

1 Answer

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The correct choice is (b) Passive filters

To elaborate: Simple filters created by using resistors and capacitors or inductors and capacitors are called passive filters because they use passive components that do not amplify. In communication work, many filters are of the passive LC variety, although many other types are used.

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