ETC EngineeringMCQs
Home › Measurements & Instrumentation › For a balanced three-phase load at unity power factor, the two wattmeters in the two-wattmeter method ideally read?
MCQ Practice Question
Measurements & InstrumentationThree-Phase Measurement

For a balanced three-phase load at unity power factor, the two wattmeters in the two-wattmeter method ideally read?

  • AEqual positive values
  • BEqual and opposite values
  • COne zero and one negative
  • DBoth zero
Report an error
Correct Answer: A. Equal positive values
Explanation: At φ=0, W1=VLIL cos30° and W2=VLIL cos30°, so the readings are equal and positive.
Reference: Standard measurements and instrumentation: three-phase measurement
Continue practicing: Measurements & Instrumentation MCQs or browse all MCQs.