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For any cascaded amplifier network, which of these are incorrect?

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For any cascaded amplifier network, which of these are incorrect?

(a) Cascading increases gain

(b) Overall input resistance is equal to the input resistance of the first amplifier

(c) The overall output resistance is less than the lowest output resistance in all amplifiers used

(d) Loading effect occurs

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The above asked question is from Cascaded Amplifier in chapter General and Feedback Amplifiers of Analog Circuits

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The correct option is (c) The overall output resistance is less than the lowest output resistance in all amplifiers used

Easy explanation: In cascading, the output of one amplifier is connected to the input of another amplifier. It is used to increase gain while obtaining desired values of input and output resistances. Overall input resistance is the same as input resistance of the first amplifier and net output resistance is the same as output resistance of the last (n^th) amplifier in the network. When amplifiers are connected in cascade, then loading effect does occur.

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