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What is the role of the rectifier section in an electronic multimeter?
1. It limits the magnitude of the input voltage to the desired value.
2. It selects the various measurement functions of the instrument such as voltage, current or resistance.
3. It provides the capability of resistance measurement.
4. It converts an AC input voltage to a proportional DC value.

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Correct Answer - Option 4 : It converts an AC input voltage to a proportional DC value.

Explanation

  • rectifier is a device that converts an oscillating two-directional alternating current (AC) into a single-directional direct current (DC).
  • Rectifiers can take a wide variety of physical forms, from vacuum tube diodes and crystal radio receivers to modern silicon-based diodes.
  • There are two types of rectifiers: Half wave rectifier and full-wave rectifier.
    • Half-wave rectifiers work by eliminating one side of the AC, thereby only allowing one direction of current to pass through.
      • Since half of the AC power input goes unused, half-wave rectifiers produce a very inefficient conversion.
    • A full-wave rectifier eliminates AC from both directions hence it is more efficient.
  • Rectifiers are mostly used in Power supplies, inverters, etc.

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