In the two-wattmeter method of three phase power measurement, if the readings of two wattmeters are WI = 200 Watts and W2 = -200 Watts, then the operating power factor of the load is equal to:

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MPPGCL JE Electrical 28 April 2023 Shift 1 Official Paper
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  1. zero
  2. 0.8
  3. 0.5
  4. 1

Answer (Detailed Solution Below)

Option 1 : zero
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MPPGCL JE Electrical Full Test 1
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Two Wattmeter Method of Power Measurement

The wattmeter meter readings are:

where, 

The power factor is given by cosϕ.

Calculation:

Given, W1 = 200 Watts and W2 = -200 Watts

ϕ = 90° 

Power factor = cos 90° = 0

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