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Question

How many diodes are required to build a full wave rectifier from a Centre Tap transformer?

This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
2

Full Wave Rectifier Diode Requirement

A full wave rectifier converts the entire input AC waveform (both positive and negative halves) into a pulsating DC output. When using a center tapped transformer, a specific number of diodes are required to achieve this rectification.

Center Tap Transformer Rectifier Configuration

The standard circuit configuration for a full wave rectifier employing a center-tapped transformer utilizes two diodes. Each diode is placed in series with one half of the secondary winding. During the positive half-cycle of the input AC voltage, one diode conducts, while the other remains off. Conversely, during the negative half-cycle, the second diode conducts, and the first diode is off. This ensures current flows through the load in the same direction for both halves of the input cycle.

  • Circuit Type: Full Wave Rectifier
  • Transformer: Center Tapped
  • Diodes Required: 2

Therefore, exactly 2 diodes are needed to construct a full wave rectifier circuit using a center-tapped transformer.

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