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Measurement of power and power factor of a 3-phase system by two wattmeter method can be obtained in case of 

1. Balanced load and balanced source 

2. Balanced source with 3-phase 3-wire unbalanced load 

3. Unbalanced source with 3-phase 3-wire balanced load 

4. Balanced source with 3-phase 4-wire unbalanced load 

5. unbalanced and unbalanced source 

 

(a) 1 only (b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5 
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Measurement of power and power factor of a 3-phase system by two wattmeter method can be obtained in case of 

1. Balanced load and balanced source 

2. Balanced source with 3-phase 3-wire unbalanced load 

3. Unbalanced source with 3-phase 3-wire balanced load 

4. Balanced source with 3-phase 4-wire unbalanced load 

5. unbalanced and unbalanced source 

 

(a) 1 only (b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5 

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