THREE PHASE CIRCUIT - Quiz

1) Which method is used for 3f power measurement when load is unbalanced?

One watt meter method Voltmeter method Ammeter method Three watt meter method

2) What is the value of power factor when two watt meter readings are equal in 2 watt meter method of power measurement?

Unity 0.5 lagging 0.5 leading Less than 0.5

3) What is the reading in second watt meter W2 if the first watt meter reading is W1 = 100W at the p.f 0.5?

200W Zero 100W 50W

4) What is the formula for total power in three watt meter method of power measurement?

W1 - W2 W1+W2+W3 W1+W2 W1(W2+W3)

5) Where two watt meter method of power measurement is used?

Balanced load only Unbalanced load only Balanced and unbalanced load Half full load