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Three Phase AC Circuits MCQs With Explanatory Answers

Three Phase AC Circuits  (MCQs  With Explanatory Answers)

All kinds of Three Phase AC Circuits mcqs  with explanation. For explanatory answer. click on the toggle button labeled as” check explanatory answer”.

1. Power in a Three Phase Circuit = _________.

  1. P = 3 VPh IPh CosФ
  2. P = √3 VL IL CosФ
  3. Both 1 & 2.
  4. None of The Above

Show Explanatory Answer

Show Explanatory Answer

Answer:  (3)…Both 1 & 2.
Explanatory Answer:
Total Power in a Three Phase Circuit,
P = 3 x Power per Phase,
P = 3 x VPh IPh CosФ
P = 3 VPh IPh CosФ…………(1)

[For a Delta Connection] [VPh = VL and IPh = IL/√3.]

then putting the values in eq …..(1)
P = 3 x VL x ( IL/√3) x CosФ
P = √3 x√3 x VL x ( IL/√3) x CosФ …{ 3 = √3x√3 }
P = √3 x VLx IL x CosФ ….Ans.

Also
[For Star Connection] [VPh = VL/√3 and IPh = IL] Putting the values again in eq…….(1)
P = 3 x (VL/√3 ) x IL x CosФ
P = √3 x√3 x (VL/√3 ) x IL x CosФ …{ 3 = √3x√3 }
P = √3 x VL x IL x CosФ ….Ans.

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2 comments

  1. Muhammad Atif Shehzad

    Dear have you post only one MCQ in this cahp?

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