**Description : **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

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- ... b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5