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Two ports containing no sources in their branches are called?

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Two ports containing no sources in their branches are called?

(a) active ports

(b) passive ports

(c) one port

(d) three port

This question was addressed to me in an internship interview.

This interesting question is from Open Circuit Impedence(Z) Parameters topic in chapter Two-Port Networks of Network Theory

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Right choice is (b) passive ports

Easy explanation: Two ports containing no sources in their branches are called passive ports; among them are power transmission lines and transformers.

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