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Question

Which of the following devices is used to convert alternating current into direct current?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
Rectifier

Rectifier Function for AC to DC Conversion

The question asks to identify the device used for converting alternating current (AC) into direct current (DC).

A Rectifier is the specific electronic component designed for this purpose. It takes AC input, which changes direction periodically, and outputs DC, which flows in a single direction.

Evaluating Other Options

  • Calorimeter: This device measures heat changes and is unrelated to electrical current conversion.
  • Rheostat: A rheostat is a variable resistor used to control the magnitude of current, but it does not change the type of current (AC to DC).
  • Capacitor: While capacitors play roles in smoothing DC voltage after rectification or storing energy, they do not inherently perform the AC to DC conversion process itself.

Therefore, the correct device for converting AC to DC is a Rectifier.

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