An amplifier is used to obtain-

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BDL MT Electrical 17 April 2022 Official Paper
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  1. Alternation of the input signal
  2. Amplification of the frequency response of a communication signal
  3. Distortion-less reproduction of radio signal
  4. Increased voltage, current or power of an input signal

Answer (Detailed Solution Below)

Option 4 : Increased voltage, current or power of an input signal
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ST 1: BDL MT Thermodynamics
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Concept:

  • The Amplifier is an electronic circuit that is used to increase the strength of a weak input signal.
  • Strength means increasing voltage current and Power gain.
  • The process of increasing the strength of a weak signal is known as amplification
  • An amplifier is used to obtain an amplification of a communication signal
  • It is because reactance of the capacitors in the circuit changes with signal frequency and hence affects the output voltage
  • The curve drawn between voltage gain and the signal frequency of an amplifier is known as frequency response
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