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How many methods of coupling are used for a cascading transistor amplifier?

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How many methods of coupling are used for a cascading transistor amplifier?

(a) 3

(b) 4

(c) 2

(d) 5

I have been asked this question during a job interview.

The doubt is from Cascading Transistor Amplifiers topic in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct option is (b) 4

To explain I would say: There are four types of coupling mechanisms used. They are Resistance-capacitance coupling, thermal coupling, impedance coupling and transformer coupling. Resistance-capacitance coupling is the most vastly used mechanism.

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