BC 194 is the transistor used for:

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. the amplification of AF and RF signals
  2. the rectification of AC
  3. the amplification of AF signal
  4. the amplification of RF signal

Answer (Detailed Solution Below)

Option 3 : the amplification of AF signal
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BC 194 is the transistor used for the amplification of AF signals.

Types of amplifiers

1.) Radio-frequency (RF) amplifier

  • RF amplifiers are radio frequency amplifiers.
  • They increase the amplitude of radio frequency waves. 20kHz to 300GHz. These are found in satellites, cell phone towers, and in dish antennas.

2.) Audio-frequency (AF) amplifier

  • AF amplifiers are audio frequency amplifiers.
  • They increase the amplitude of waves from 20Hz to 20kHz.
  • These are widely used in speakers, microphones, earphones, etc
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