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  1. Which one among the following components is used as an amplifying device?
    1. Transformer
    2. Diode
    3. Capacitor
    4. Transistor
Correct Option: D

An amplifier is an electronic device that increases the voltage, current, or power of a signal.Generally transistors are active devices that can be used with discrete components to amplify voltage, power or both depending upon the configuration.



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