The AC power of output signal is obtained by ___________ of amplifier.

This question was previously asked in
RRB ALP Instrument Mechanic 23 Jan 2019 Official Paper (Shift 1)
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  1. AC biasing voltage 
  2. DC biasing voltage
  3. input AC voltage
  4. Input DC voltage

Answer (Detailed Solution Below)

Option 3 : input AC voltage
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The AC power of the output signal from an amplifier is primarily determined by the input AC voltage, as amplifiers primarily amplify the alternating current (AC) component of the input signal.

Input AC Voltage: The input signal to an amplifier is often an AC voltage waveform. This AC voltage represents the varying voltage levels of the signal being amplified, such as an audio signal in the case of a stereo amplifier or a radio frequency signal in the case of a radio frequency amplifier.
Here, option 3 is correct.
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