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What does cascading of two transistor amplifiers imply? (a)Output of first stage sent to input of second stage

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What does cascading of two transistor amplifiers imply?

(a) Output of first stage sent to input of second stage

(b) Output of first stage sent to coupling device

(c) Input of first stage sent to input of second stage

(d) Not related

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This question is from Cascading Transistor Amplifiers in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right option is (b) Output of first stage sent to coupling device

The explanation: In multi-stage amplifiers, the output of first stage is coupled to the input of second stage using a coupling device. The coupling devices is typically a capacitor or a transformer. Cascading is known as the process of combining two amplifier stages using a coupling device.

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