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Three-Phase Rectifiers MCQs

Practice Three-Phase Rectifiers MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Power ElectronicsThree-Phase Rectifiers

For an ideal three-phase fully controlled bridge rectifier with continuous DC current, the average output voltage is commonly written as?

  • A1.35 VLL cos alpha
  • B0.45 VLL cos alpha
  • C2.34 VLL sin alpha
  • DVLL/(1-D)
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Correct Answer: A. 1.35 VLL cos alpha
Explanation: For a six-pulse three-phase full converter with continuous current and negligible overlap, Vdc=1.35 VLL cos alpha, where VLL is the RMS line-to-line input voltage.
Reference: Standard power electronics: three-phase rectifiers
Question 4
Power ElectronicsThree-Phase Rectifiers

Compared with a single-phase rectifier, a three-phase bridge generally provides?

  • ALower output ripple for comparable conditions
  • BOnly one output pulse per cycle
  • CNo DC component
  • DZero power capability
Report an error
Correct Answer: A. Lower output ripple for comparable conditions
Explanation: The higher pulse number of a three-phase bridge produces smoother DC and makes filtering easier.
Reference: Standard power electronics: three-phase rectifiers